Need some help....

krwheel is right.

That is one key difference, I am terrible at remembering the details of something years after the fact. My ISFJ friend was telling me the plot-line from the original Star Craft the other day, because he actually remembered it!

There are actually a lot more INFJ's out there; we're probably not that rare, just we often test as something else. See, with introverted sensing, which is what the ISFJ's have, you have to build your inner world on facts. With the INFJ, you don't have to use facts to build your inner world, you can build WHATEVER you want. This results in INFJ's being highly diverse individuals who usually do not see eye-to-eye on things. ISFJ's are very likely to see eye-to-eye on things, unless their inner world of sensory details leads them to different conclusions. Even then, it's really just a matter of reconciling facts with each other, and at the very least they could relate to each other's point of view after doing that.

An INFJ's inner world is unique, and it's doubtful anyone else could relate to it. Often, we may not even know why we think what we think because we came to a conclusion about it already, and the details that led us to that conclusion are irrelevant. It is the opposite for the ISFJ, the details that caused them to reach the conclusion are very important, and they'll remember them.

Let's see...

INFJ's find truths by thinking about things. We may space out for ten minutes to think over something, and draw a very insightful conclusion from our thoughts that we apply in our life going forward.

We get upset when there is a law that is unfair or unjust. We want everyone treated fairly and similarly. When things don't work this way, we'll get far more upset than any other personality type.

See an ISFJ is likely to take a law at face value. This is the law, it has been around for a 100 years, everyone knows about it, it's set in stone. Considering that it should be changed may never cross their mind.

An INFJ would analyze the law and how it affected society, they would then compare this law against an ideal of how things should be. If it doesn't meet the ideal, then it's a bad law and we want it changed. Just as an example, I'm utterly disenfranchised with the way the US government operates because of the pervasive corruption that now exists. Other people see this as the way things have always been, but I don't care how it was, I look at it today and it's corrupt, and getting worse every year. Rules that were long-held to be essential to the operation of the congress are being ignored because parties in charge bend the rules to favor themselves. Corporations now get to fund political campaigns....

You see how much this bothers me? I almost turned the entire post into this.

See an ISFJ is less likely to concern themselves with fairness as far as the law is concerned. Their dominant Si generally leads them to accept what is; they're not constantly imagining how things could be improved. If I point out to my ISFJ friend, why the government is corrupt and unfair, he likely agrees with me and then digs up a few details that support my claim. Suggesting how to change it, and how it should operate is a bit out of his league. He could do it if he really thought about it, but he isn't going to trouble himself with that. As an INFJ, I can't help but trouble myself with it.

Of course INFJ's pick their battles when it comes to fairness and justice. We all get worked up over different topics, but that gives you an idea of what having a strong Ni does when paired with Fe and Ti.