INTJ's may have a thirst for knowledge, but it may not necessarily make us happier when we find it. In fact, I usually find it's the opposite. The sense of wonder goes, and a cynical impression is usually left. At points I have been left with the impression that there is little value in humanity. It's kind of cyclical. Wonder->Discover->Delve->Absorb->Loathe->Accept->Wonder. Or something like that. At least, that's what I've found in my reaction to studies of psychology, anthropology, sociology, philosophy, and politics. More hard topics like chemistry and physics might offer less disappointing results, and I can see why many INTJ's choose to go that route.
Some of the most important lessons you learn can be completely soul-crushing. But they can be highly liberating as well.
