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What's the ultimate difference between an NTJ and an NFJ?

6.8K views 47 replies 20 participants last post by  Eset  
#1 · (Edited)
If you have come to the conclusion that you're an Ni-dom (meaning that zoning out is your preferred state, you easily follow ideas and concepts but not in a fluid and easy way like a Ne type does and you're building a future vision of yourself), what is the easiest and most clear-cut way to differentiate between the two types, INTJ and INFJ?
I mean, everybody loves to have people around (like a Fe) and everybody wants to get ahead in his life (like a Te), that can't be the deciding factor here.

I give you a few examples:

I organize a party because I love people around but also to make a name for myself. Is it Fe or Te?
I talk to someone but try not to hurt his/her feelings because I have to talk to him/her another time - or I simply need him/her as a friend. Is it Fe or Te?
I try to make sense of people but sometimes I give up and accept their values because it makes things easier on a daily basis. I don't like it but that's life right?


I like to see the world as it is and see how things come together - this is easy, it's Ni.
But I'm stuck with my second function. How do you decide between Fe or Te? Meaning that if I have Fe as my second function then Te is my most vulnerable function, and vice versa. So it may be easier to determine the weakest functions.
 
#2 ·
You sound more INTJ to me. These situations sound like Te and Fi. You're either being nice because you're close to the person or because it's part of a longterm plan. INTJs can be pretty social, even charming, when it's called for.

I don't know if this is a good example or not but an INTJ vs INFJ moment in my life was when someone told me and an INTJ that they'd need to take a day off work to go to the funeral of a recently deceased relative. I started to respond with "Oh, I'm so sorry for your loss." The INTJ spoke first though, and his response was "Ok, I'll put that in the calendar."

What do you think your response would have been?
 
#3 · (Edited)
I definitely would've said "Sorry". I mean what kind of person doesn't reply that? It isn't really a feely thing, I don't have to feel for that person to know what kind of suffering (s)he went through.

But another example:

I've been friends with a girl (ISFJ) for a couple of years, and it was always a firendship, I never felt any need for physical intimacy. And I'm Glad for that. I want to keep things that way.
Recently I've noticed some changes on her (clothing) that I find alluring. She has to know that I find it alluring because I told her. I pray to God that it's a passing phase and it's not a serious thing because I need a friend like that and I don't wanna stir things up (couldn't possibly even, her boyfriend is also a good friend of mine).
Now my best bet is that she simply wants self-confidence and she knows she can get it from me. But I have to be very cautious. A friendship like that can easily lead into other things and I've been there.
So now I keep my distance for the moment while it passes and my thoughts are clear again.

I don't know if that helps but that's it.

(I feel I'm too feely and emotional for an INTJ and INFJs are known to be pretty NT like.)
 
#4 · (Edited)
Off the surface it is super hard
At first

My mom is INTJ my sis is INFJ
Ni is prominent and it shows.

My sis can appear NTJ off surface. Almost ENJ actually. (She is not) she just has Fe polish. And that is key is spotting whether you're seeing Fe or not. INFJ has extremely sophisticated use of Fe. It's why they can even at a glance look extrovert. My sis has many friends and groups.

Trying to see if you see alotta Fe is helpful in detecting. But odd thing is an INTJ could appear socially fine. They are not going to have that Fe ease tho. Granted I know them better. But it is a lot more work for my mom to be social than my sis.

INTJ are better at let live let be imo (unless you find some Fi true to their heart topic). INFJ like to help everyone and their brother. So they can accidentally step on toes with good intentions and soliciting. Not that my mother never solicits with INTJ. But it's more general know it all statements. I.e. My mom: "I would do this, I believe this, studies show this" vs my sis: "you should do this, We read this in a class, I seen this and that work"

INTJ Te refers more to data it saw. "I saw on 20/20"
INFJ Fe refers more to a group discussion or lesson and self help theories they read (an ESTP write :laughing: -lmao my sis is always quoting dale carneige, I am like chick i don't need this lesson it's in my internal map tehe)

INTJ better at handling stress (like way better) at least what meets the eye. Externally speaking what we see. INTJ internalizes. INFJ had weird dramatic outbursts. Honestly this was the first thing I referenced in my head when I seen this question lol. Eh well my INTJ mom is not going to throw a plate of bacon across the kitchen because it got burnt scream about a bad day and shriek and cry and say she should just kill herself over getting a flat tire :laughing: .

I wouldn't say either is good at constructive criticism in specific ways. INTJ fine if it's general stuff and tactic and Te or even Ti suggested. They do not like their personal stuff on the table at all. They evade. While INFJ with general stuff and tactic has harder time listening to other ways. But they are always trying to seek enlightenment so they will put their personal stuff outward and explore. Lol no way in fuck my INTJ mom would leave her personal life for exploration in discussion unless she is reflecting and leading this discussion
 
#5 ·
Thinkers think that you can find truth by 1) logical discrimination of relevant and irrelevant content or 2) judging the factual evidence of the situation.

Feelers tend to think truths are more subjective than this; some description put it more or less as "everything tells/implies something about the nature of the thing." Lol. So if someone tells us his opinion, a thinker would judge the validity of this opinion, whereas a feeler would judge more what this opinion implies about the person.

Anyway, I was talking about news with one NT and I asked him which sources he trusts, well he doesn't trust anything he cannot reason himself and finds most sources unreliable and biased to some extent; but then he pointed out what I should have already known - that I, as a feeler, should see any piece of news as an implication of something, that there is some valid information in that news story simply because it was made public - whether the news itself is truthful or fake, it tells us something. But this is more Ti/Fe debate perhaps.

Te would rely on some sort of consensus of facts, that events took place in a certain way and this can be proven. Whereas Fi would be there to seek more nuanced judgement of something; and if thinking is already focused on objectivity, that things are as they are, nuance has to be found from feeling values and personal relatedness.

But this is only relevant if you believe functions balance each other out this nicely.
 
#8 · (Edited)
At some point in a Ni doms life the question came up, what do I do with this information?
Whatever choice they took back then Fe or Te has decided their fate.

"Although it is not altogether in the line of the introverted intuitive type to make
of perception a moral problem, since a certain reinforcement of the rational functions
is required for this, yet even a relatively slight differentiation of judgment would
suffice to transfer intuitive perception from the purely æsthetic into the moral
sphere. A variety of this type is thus produced which differs essentially from its
æsthetic form, although none the less characteristic of the introverted intuitive. The
moral problem come into being when the intuitive tries to relate himself to his
vision, when he is no longe satisfied with mere perception and its æsthetic shaping
and estimation, but confronts the question: What does this mean for me and for the
world? What emerges from this vision in the way of a duty or task, either for me or
for the world? The pure intuitive who represses judgment or possesses it only under
the spell of perception never meets this question fundamentally, since his only
problem is the How of perception. He, therefore, finds the moral problem
unintelligible, even absurd, and as far as possible forbids his thoughts to dwell upon
the disconcerting vision. It is different with the morally orientated intuitive. He
concerns himself with the meaning of his vision; he troubles less about its further
æsthetic possibilites than about the possible moral effects which emerge from its
intrinsic significance. His judgment allows him to discern, though often only darkly,
that he, as a mind and as a totality, is in some way inter-related with his vision,
that it is something which cannot just be perceived but which also would fain become
the life of the subject. Through this realization he feels bound to transform his
vision into his own life. But, since he tends to rely exclusively upon his vision, his
moral effort becomes one-sided, he makes himself and his life symbolic, adapted, it is
true, to the inner and eternal meaning of events, but unadapted to the actual present-
day reality. Therewith he also deprives himself of any influence upon it, because he
remains unintelligible. His language is not that which is commonly spoken--it becomes
too subjective. His argument lacks convincing reason. He can only confess or pronounce
His is the 'voice of one crying in the wilderness'."
Car Jung, Psychological Types, page 509-510
 
#11 ·
I thought you hated Fe?

I don't go in depth with regards to expressing my emotions or feelings but they're hardly repressed.

Something common to NF types is a warmth they will exude, even if they don't think so, it's there.
Something about NF types will seem inviting, comfortable, and draw you in.

If you're unsure of your type, read this:
Descriptions of the MBTI Step II™ Facets

Just make note of which ones you prefer, and you should clearly see what you are by dichotomy.
Then you roll with the cognitive functions and just understand that it's possible to be, say, an INFP yet have highly developed Si which might make you look like an ISTJ by cognitive functions.


This stuff is about preferences, not skill level of functions, so read that, make notes of which you prefer and you'll be able to type yourself better than any of us can.


Bothering with how to tell INTJ from INFJ etc is just useless for typing yourself.
Just figure out your dichotomy and there you go, done, that's you. Then you can just compare other types to yourself and get a feel for what's what.


If you HAD to go by cognitive functions for reasons I can't comprehend, then I mean telling Fe from Te should be the easiest thing of all time. Completely different methods of making judgements. A direct clash, imo.

If you're umming and ahhing over which one is you, consider the fact that neither of them might be your primary judgment function, which means you might not be an Ni dom.

Straight up, Te or Fe should resonate and click with regards to how you make decisions if you're an Ni dom.
If they don't, chances are Fi or Ti are higher than Te or Fe.
 
#13 ·
If you HAD to go by cognitive functions for reasons I can't comprehend, then I mean telling Fe from Te should be the easiest thing of all time. Completely different methods of making judgements. A direct clash, imo.
For reference to the OP, Te judges based on externally verifiable factors to determine truth while Fe judges based on social dynamics. It seems like it should be super-easy, though I have known people who couldn't decide which of the two they act based on.
 
#22 ·
Oh come on, Ni doms love parties and being surrounded by people and drawing everyones attention to themselves.
This is what people who live in their head do. They need to make a name for themselves.
Make sure people know who they are and respect them.
Gather round all their friends and family and make sure everyone knows how good a party they put on.

That's what Ni dom is all about. REPUTATION. STREET-CRED.

Nobody fucks with an Ni dom. You won't get invited to any of their FULLY SICK house-parties if you do.
 
#26 ·
I mean, everybody loves to have people around (like a Fe) [...] that can't be the deciding factor here.
No, not everybody loves this, so it could be a contributing factor in your decision.

The examples you gave don't fit stereotypical INTJ, but the examples you provided are situations in which you receive some benefit, so it's hard to say. What about strangers?

You sound more INTJ to me. These situations sound like Te and Fi. You're either being nice because you're close to the person or because it's part of a longterm plan. INTJs can be pretty social, even charming, when it's called for.
Very true. I used to manage a brunch/dinner meetup group to help new arrivals make friends. My interest was in finding decent restaurants and having conversation while doing so; the friends part was for everybody else.

I don't know if this is a good example or not but an INTJ vs INFJ moment in my life was when someone told me and an INTJ that they'd need to take a day off work to go to the funeral of a recently deceased relative. I started to respond with "Oh, I'm so sorry for your loss." The INTJ spoke first though, and his response was "Ok, I'll put that in the calendar."

What do you think your response would have been?
I think it's a great example.
 
#27 ·
What about strangers?
I'm not good with strangers. Terrible even.
I always try to find some outsider to talk to and maybe (s)he will drag me in the middle. (who usually turns up just as much a loner as I am so it's not a good solution)
The occasions I mentioned were special because I was the host and I made the music so I didn't feel like I have to try and merge with anyone.
But if there aren't any people I know it's usally very hard for me to pick up on the mood. I always seek out someone as a general rule.
 
#28 ·
Behavioural differences between INTJs and INFJs
INFJs are more soothing and caring of others, using their secondary Fe to conform with external norms of "right and wrong".
INTJs are more forceful in their need to express their ideas and visions and put them to practice to secondary Te.
 
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#30 · (Edited)
INFJs are more soothing and caring of others, using their secondary Fe to conform with external norms of "right and wrong".
..to a degree.
The INFJ will only conform with external norms of "right and wrong" in so far as they align with their Ni vision of what they want to achieve. If he INFJ has a vision, and group principles and values or whatever you want to say aren't in line with that, the INFJ won't want to conform at all.
Comes across as being the complete opposite of "soothing and caring" - they'll be cold, blunt and stubborn, when things aren't (or won't, in the future) be aligned with their Ni visions and goals etc.

 
This is the reason we come across kind of weird, as if there's something off about us. Our Fe supports our Ni - we're not an Fe dom, we're not all about those social norms etc. Only are if they're in support of our Ni.
If they're not, fuck 'em, they mean nothing.
Ofc depending on how healthy we are, we might be more willing to compromise and bend to the will of other people (not healthy for the INFJ, we're at our best when we're under the guidance of Ni, even if it means letting people down, it's a mental health thing).

Actually a little example might be of an INFJ who gets told to do something a certain way that clashes with how their Ni sees it happening. So they'll agree at the time with the person talking.
Then in practice, they will ignore it.
They already knew they would ignore it. They already knew it was wrong, yet agreed at the time as to not start conflict (Fe) - the reality is it didn't match their Ni vision and therefore isn't put into action.
They should have just said in the first place that what they're being told won't happen IRL for A, B and C reasons or whatever - but this isn't how we work. We understand this bit after the fact.

So then we wind up doing something our own way, not taking someone elses advice, and having to deal with any shit that comes our way if the other person finds out and gets all butthurt or whatever.
It's just how it is for us.
We need to not let Fe take over our Ni. Gotta set boundaries and stand up straight.

My personal favourite is saying to people in those situations "nah it's all good, I'll just do it my way"
and then when questioned as to "why?" basically just leaving them in the dark, because I don't want to tell them their way is shithouse. So the conversation ends with me basically looking like a n arrogant little dick who is just disagreeing for no reason.

The reality is like I said, I'm being told to do something that doesn't match my Ni visions so I know it won't happen. I stand strong to my Ni visions and reject the advice I'm told. I don't go into detail because I'm a terrible liar, and don't want to hurt the other parties feelings.
Also, sometimes, we can't go into detail because we might not even be able to express why we feel the way we feel at the time about what they're saying.
Our Ni is just taking in information, and it's not matching how it wants things to play out - in the moment, we don't realise this, we just hear something that's wrong, and that's it, it's just wrong.

So now I'm in a position of dismissing someones advice for reasons I haven't expressed, or can't express at the time.
This is how some INFJs look like smug little pricks but we got no choice, it's actually us attempting to remain true to ourselves + not harm other parties feelings etc.



This goes for INTJs as well and explains why sometimes, INTJs come across as if they're talking out their arse - they use Te to form strong logical arguments in support of their vision. However if they realise that the logical argument is in conflict with their Ni vision, they will straight up change their argument, or alter their point of view - comes across as contradictory and highly illogical, but it's the INTJ remaining true to whatever their Ni vision is.
They use Te in support of Ni.

Unlike say an ENTJ who will be more likely to roll with the punches so to speak, as their Ni is in support of Te - so they'll shift their goals and visions to match what they believe is going to work for real, hence why they earn more $$$ than everyone else, they've got the best dom-aux combo for striving towards to success, without being bound by any goals - rather they shift the goals as they go so they can just keep climbing up and up and up without the hangups INTJs and INFJs have with regards to their Ni.


Don't ask why I rambled on about other shit. I wanted to just kinda touch on the INFJ bit you posted, and then felt like I had to explain how I see how the same thing kinda manifests in the INTJ. Then I wanted to write up a bit about how I see Ni as a supporting function act.
 
#29 · (Edited)
If you have come to the conclusion that you're an Ni-dom (meaning that zoning out is your preferred state, you easily follow ideas and concepts but not in a fluid and easy way like a Ne type does and you're building a future vision of yourself), what is the easiest and most clear-cut way to differentiate between the two types, INTJ and INFJ?
I mean, everybody loves to have people around (like a Fe) and everybody wants to get ahead in his life (like a Te), that can't be the deciding factor here.

I give you a few examples:

I organize a party because I love people around but also to make a name for myself. Is it Fe or Te?
I talk to someone but try not to hurt his/her feelings because I have to talk to him/her another time - or I simply need him/her as a friend. Is it Fe or Te?
I try to make sense of people but sometimes I give up and accept their values because it makes things easier on a daily basis. I don't like it but that's life right?
As I expounded on in another thread;

 
I suppose it is (useful) to acknowledge the distinction(s) between "subject-fixation," and "socialization," - I would not go so far to say, (X)-type is the "extrovert," of the introverts as that is incoherent. However, I can [see what (X)-post] is implying (&) have observed similar; however, I can speculate it does not appear to be extroversion/introversion per se.

I prefer "external/internal," to "extroversion/introversion," when discussing the other function distinctions, (Fe - Fi) - for less confusion.

Consider the distinctions between "social," thinking women - and "social" thinking males:

(F)-types acquire high-functioning subject-fixation; (which means more 'socialization' with (X)) subjects, but does not imply (F)-type is "gaining energy," from the subjects in which they associate;) thus, may or may not be more adverse than a thinking-type to participate socially. (Fe) enjoys the presence or 'external awareness' of other specimen (and subject anatomic / psychological states) via reflexive-mirroring; [and requires it for proper-functionality] without such, (X)-function will malfunction, respectively [in other words, (Fe) may manifest in stand-off observation (re: the "INFJ" at a party in a corner") - or direct engagement.

An (INFP); for example, can 'energize' their subject-fixation by thinking about subject(s) and does not require (X)-'awareness' of various other anatomic-subjects / psych-wellbeing - rather only the anatomical structure; psychological-state health of themselves is needed; and no observing (interaction) with (X)-subjects in the manner of (Fe); (re: "INFP daydreaming,") - and INFJ more 'external' manipulation of subjects via (Ni) ::


The (Fi) says: Live and let live; (by all means)

The (Fe) says: Live, but let's at least thrive (by all means)



In other word(s) - "INFJ," for example, are fueling their dominant/aux - (Fe/Fi) usage respectively, - rather than 'energizing' their introversion' [while for some Fe-types (external stimulus) is more needed than (Fi-types), although it seems to vary among individual-preferences rather type; INFJ with more (Ni/Ti) favoritism will likely follow the INTJ-(approach) ::

[Cognitive-function developed "degrees" or fluctuation of these said degrees; vary among individuals].


Ex; (1) --


(X) INFJ made it of importance/priority to ask, "how is everyone doing?" (and other subject-fixate states of well-being)

(X) INFJ was "drained," sufficiently by all the subject-oriented interaction;

[[This usually occurs at abnormally - "higher," rates than the most 'introverted-extrovert,']] -- this does not imply ambiverison.

A (T) can be "more social," but less fixated on the subjects; thus may appear 'less engaged' - but not necessarily opportunistic (or less social) if spoken to; which varies respectively from (T)-type to (T)-type. The "INTP," can appear more ('social') than an INTJ, due to acquiring (Fe). Which is demonstrably not the case - rather, they are more subject-fixated.

You may be observing the distinctions between (Fe/Fi) - rather than (T/F) or introversion/extroversion.


__________

Ex; (2) --

I am an INTJ that suffer(s) little from social-anxieties; I "talk more," to other subjects and people in general; when the (Te/Ti)-functions are being stimulated, sufficiently.

An "ISFJ," may have nothing to say / verbally contribute in an (Te/Ti)-favoritism locality; which seems to be the case for many feeler(s) offline, thus tend to be "stand-offish," and reluctant to associate with the others, of the (Te/Ti) group. This overall does not entail (X)-specimens of a particular typology are more (X) than (Y), over another due to being less-active in certain localities; but I can entertain that ("feelers") may have more opportunism to engage their (F)-function; than (T)-users do, but this is likely simply an "illusionary-bias," [via] to subject-object fixation distinctions.


As I understand it;

(Fe)-humans will prefer the 'awareness' of various [and many anatomical / psychological-states via subject-fixation (either from "going to a party and sitting alone,") - longing to be included [but satisfied] with subject-anatomical (external) stimulus, this may include social withdrawing to gain awareness of as many subjects as [possible] to make more 'seemingly' sound-judgments off these observation - or direct engagement;

(Fi)-humanoids will prefer the 'awareness' of the fluctuation of their own anatomical / psychological-states via "subject-fixation," (themselves being the subjects) - (&) often, 'high-functioning' observation of other anatomical-subjects (and their well-being) corrupts or confuses their own [internalized-stimulus] to make 'seemingly' sound-judgment(s); psychological-states / anatomic well-being is 'determined' / or understood via the internalized-structure of themselves;

Ex; (1)

If I am uncomfortable; they must be also when I do (X) - let them be:


________

Both (Fe/Fi) distinction(s) are "concerned," with the health / well-being (psychological / anatomic) structure/states of other subjects, regardless:




(Te)-humanoid(s) will prefer 'awareness' of the (possible) fluctuation of various state-of-affairs / (indirect "subject-fixation,") via object fixation, which is why (Te)-works best with (Ni). Let "objects," represent:

(A) Things;

(B) State-of-affairs;

(C) Events;

(D) Observable conditions;


The sibling of (Se) - (Te) "morphs," organizes, or transforms state-of-affairs, "events", or objects when they fluctuate or do not change according to what is 'best fit' for the functionality of the circumstance. Skipping from (fact) to (fact) is deemed the more efficient route to maintain the order of the circumstance; because "facts," of the world are almost always, inevitable, thus (Te)-users move faster than their (Ti)-cousins (seeking truths [and repairing error(s) as they go]).

(Se)-appears to do with this through spatial awareness (re: space), movements (&) presentation. (Se/Fi) - will due this [via] 'spatial attentiveness to the atomic movements / space' between subjects; (re: "more likely to 'sleep around' or engage (too directly / forcefully) with other subjects (re: "fighters") than an (thinking cousin). (Se/Fe) users will be the roughest.
 
#34 ·
As I expounded on in another thread;
Thanks for all that.
I tried to make sense of it but it's so damn complicated.

The truth is that if I'm an INTJ then I'm completely missing out on Fe (INTJ's most vulnerable function) so much that I couldn't really understand the concept of Fe.
Worse there is a phenomenon that the worse people are in something the more they think of themselves in that regard. So I can look at Fe and think, "oh I understand that, of course", because I lack the necessary traits to even realize that I suck at it. (This is called Dunning-Kruger effect by the way)

The more I look at it, the more I realize that I can't be an INFJ. If INFJ's are so depending on Fe and are good with people then it's almost certain that I'm not.
Add to that that I was drawn to sciences as a kid, was always told to be cold, and got more emotional only growing up, had most clashes with ESFJ/ISFJ types (the reverse of INTJ), always stood up for myself...etc

I think it's enough info to say that I'm not an INFJ.
 
#37 ·
The only real difference is Fe/Ti and Te/Fi in the ego. I think the best way to spot the difference between an INFJ (who are just as much "thinkers" as an INTJ) and an INTJ, is through behavior. I'm not one to advocate for judging types based on behavior, but in this special case I am. INTJs are not as people-focused as INFJs, and are much more "introverted" than INFJs. INTJs also don't receive intuitive insights about peolple, because they don't have the humanitarian understanding of Fe; they understand people by understanding themselves first (Fi). INTJs receive insights into systems (Te), and are amazing at predicting where systems are headed based on those insights. Both can be asocial or social, both can feel things deeply as well as use "cold" logic, and both types are very intuitive. It's more of where they apply their intuition that differentiates the two types. Find the main differences between Fe/Ti and Te/Fi, and you'll easily know what type you are.
 
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#43 ·
Meaning?
If I knew how either of two comes into action I would know the answer by now.
But probably feeling environment, categorizing/conceptualizing internally leading to less action and more reflecting/thinking
vs looking for sense in the environment, a tangible action then seeing how it relates to the one's ideals/values...
Am I right? Now that is difficult.

Probably neither, as I probably would know the answer by now.
 
#44 ·
Now, back to the thread.


I've just watched this video and it caused a hell of a confusion.
Since it's not the usual explanation of the types, it is not easy to tell apart the two types by things like "one is focusing on scientific facts, the other is on group harmony" which is bull...

According to this video INTJ simply means "bargains with the reasons and stands by his values"
While INFJ "bargains with feelings and stands by own logic"

It doesn't matter which is first and which is second (or in this case: second and third), because there are Feeling based INTJs and logic based INFJs.

What do you think?
 
#45 ·
According to this video INTJ simply means "bargains with the reasons and stands by his values"
While INFJ "bargains with feelings and stands by own logic"

It doesn't matter which is first and which is second (or in this case: second and third), because there are Feeling based INTJs and logic based INFJs.

What do you think?
Sounds like another person adding their own crap to the theory. I didn't watch the video though.

I read through some of the thread but I don't understand why this is difficult. Fe is judgment on the basis of people-centric criteria; Te is judgment on the basis of impersonal criteria. If you can't see a clear preference as you examine the way you've tended to evaluate things throughout your life, maybe you are close to the middle and need to look at some other factor to determine your type.
 
#46 ·
I do not like DSP's definitions of functions but the theory with high preference on tertiary is possible ( however its only preference its stil not as strong FI as in ExFP types) . I can see myself as an Si-fi=Te-Ne ISTJ. My Te is super active at work but only there. Its the only way i can type myself. Otherwise nothing fits me and whole MBTI is bogus.
 
#48 ·
What's the ultimate difference between an NTJ and an NFJ?
NTJ's preference for Te/Fi.
NFJ's preference for Fe/Ti.

I'll give you some information on the matter that might be able to clear up some issues.

The Judgement Axes Fe/Ti (a) vs. Te/Fi (b)

In general, the nature of the judging axes can be described in this way:
A asks ‘what do you think, and how can we communicate that?’
B asks ‘what do you want, and how can we get it?’
These two attitudes can be summed up as ‘translating’ and ‘operationalizing’ respectively.

The one axis (A) seeks to understand the logical form or structure underlying various sentimental appearances; thinking along this axis is a bit like trying to construct an android, a structure of programming and framework on which a realistic, socially pleasing skin is placed. A good example of this is the logical project of Russel and Whitehead, who were trying to develop and justify an abstract system that could account for every proposition in varied human experiences, cultures and languages.

The other axis (B) seeks to apprehend the hierarchy of desires motivating the creation of various structures to accomplish those desires; thinking along this axis is a bit like trying to construct a mechanical appendage controllable by a living, breathing human in order to accomplish certain tasks and thus fulfill certain desires. A good example of this is Newton’s development of calculus because he wanted to solve a specific problem and needed that framework to do it — not for its own sake.

This is the primary basis for the philosophical conflicts between A and B. This is demonstrated nicely by two quotes from famous philosophers representing each worldview:
“Behind all logic and its seeming sovereignty of movement, too, there stand valuations or, more clearly, physiological demands for the preservation of a certain type of life.” — Friedrich Nietzsche (B).
“…amidst all the variety and caprice of taste, there are certain general principles of approbation or blame, whose influence a careful eye may trace in all operations of the mind.” — David Hume (A).

Hence, the B attitude, represented by Nietzsche, assumes that people do things because they want to, they desire to, they have a passionate, sentimental drive to: desires and feelings are the metaphysical bottom-line, for which structure serves only as a vehicle. Meanwhile, the A attitude represented by Hume assumes that people do things because that is what makes sense to them: because that is the decision-making paradigm which they are working off of, and all feelings, motivations, and desires result from the way a person chooses to logically view the world, whether they realize it or not. Feelings and motivations are merely the skin of logically ascertainable principles upon which people operate.

These two views of the world are, of course, mutually inimical — they inevitably chase each other’s tails. Nietzsche says to Hume: ‘he stole that bread because he wanted to feed his family,’ to which Hume replies, ‘yes, that is true: but why did he want to feed his family? Because he is adhering to a familial principle,’ to which Nietzsche replies, ‘I suppose you could put it that way, but why is he operating according to that principle? It’s because he wants to, because he loves his family,’ to which Hume replies, ‘yes, but why does he love his family? It’s because that is his logical worldview…’
Though this is just one perspective on the matter, you'll need to research further to get a more fuller picture.