He must not only test and guide his achievement by human experience, but he must succeed or fail in proportion as he has incorporated that experience with his own.
Otherwise his own achievements become his stumbling-block, and he comes to believe in his own goodness as something outside of himself.

He makes an exception of himself, and thinks that he is different from the rank and file of his fellows.

He forgets that it is necessary to know of the lives of our contemporaries, not only in order to believe in their integrity, which is after all but the first beginnings of social morality, but in order to attain to any mental or moral integrity for ourselves or any such hope for society..