I'm curious, petitpelerin, what is meant by cause to believe in. I don't find it necessary for my work to make a difference, but, I do feel it's important to work with great people. Working at a donut shop can be satisfying when you have good clients and relate with your coworkers. I would find it awkward if I feel the company is doing something unethical and might drive me to look for other work. Does she actively seek out positions where should make that difference?
I'm more driven in finding something that fascinates; people are also important but the need to express myself socially, not as much. Could this be the intensity of Fe, primary vs. tertiary?
I could write pages on how I relate with Si; sometimes it's wonderful other times it's hopeless and catastrophic. If I'm interested in something my memory is impeccable; although you might find me describing a concept, person or an event without actually remembering the name. If I'm probed to give details about something I always second guess myself. This is why I don't do well with instructions. Unless I understand the reasoning behind something I will continue to improvise my own solutions.
Sometimes I do enjoy breaking petty conventions; just to get under people's skin. My memories are episodic, never sequential. I envy people who remember events as they happened in order. Even in literature I find myself looking back to certain things. I could never read fantasy for this particular reason. Mind you; when I read articles on dream interpretation, symbolic poetry it all makes sense.
Another key difference I noticed is debates; I found that Si/Ne look for possibilities within the established positions of the argument. This is evident when I'm listening to friends debate political issues; I might interject by saying that both arguments are horrible because they're not considering certain factors of influence and we would have to redefine the debate altogether.