INTJs are extremely subjective.
All I can say is that an INTJ works a little like this. Let's say the Jungian functions of an INTJ are given the task to fly a plane from city A to city B.
Ni, Te, Fi, and Se all get on the plane. Ni gets the pilot's seat, of course, and Te gets the copilot's seat. Fi is given a book to placate her on the journey, but Se has nothing to do so he's got his face mashed up against the window and staring outside.
Meanwhile, Ni finds a flaw in the flight plan and draws a new line on the map as a better flight trajectory, a more efficient route from city A to city B. Te is about to look it over when suddenly Ni and Te hear shouting from the cabin. Te goes out to see what's going on and finds Se pointing out the window and shouting about some mountains or something -- Te doesn't really care, and thinks that Se is just acting like his usual ADD self and smacks him around a few times to get him to shut up. When Fi tells Te to please stop it, Te yells at her, and Fi starts crying, both for Se and her own sake.
Ni is still in the cockpit, figuring that the new flight plan is good and continues following it without Te's input. Ni then sips his coffee, pondering solutions to life, the universe, and everything, and the plane goes careening into the same mountains that Se was screaming about earlier, all of them dying instantly.
And that's when the INTJ falls into a sudden coma right in the middle of history class.