Simply, the inner man - the man whose outlook is inward.
And his importance? That this is the type of a genius -- whether a large sclae, world historical genius - a Shakespeare, a Beethoven or Einstein -- or a local, tribal, town genius whose name is unrecorded (yet who might be the originator of some great anonymous ballad, folk song -- or a technological breakthrough such as the spade, spear-thrower, arch or stirrup).
Such creativity is so rare, so difficult (far more difficult than commonly imagined) that it requires a special kind of mind -- a mind especially designed for this kind of work (inner work).
There need not be many such men -- indeed, there should not be too many, since the necessary mind is relatively unfit for the primary, day-to-day, activities of survival and reproduction of the species. But such men are needed -- sooner or later, from time to time.
When the Endogenous Personality is combined with a special ability we get a genius - of greatness in proportion to the ability.
But even on its own, even with near-average special ability - and although less-powerfully useful, the Endogenous Personality brings - provides - a special angle, a perspective, to the problems of group living.
The EP will stay focused on a problem longer than most men -- he will look at the problem in a different way -- he will deploy different (more inward) procedures of understanding -- more detached, more abstracting. Hence he is more likely to see something new -- useful in a new and different way.
His stance is less personal -- he stands back somewhat -- he sees the problme in a wide scope exactly because he sees the problem detached from his personal concerns (for instance with status, sex, wealth) - which is how most men see problems: just a a means to that end.
The inner man gets the greatest satisfaction from inner work - it is what he most wants to do.