Quote from : A Fine and Private Place Book

Man searches constantly for identity, he thought as he trotted along the gravel path. He has no real proof of this existence except for the reaction of other people to that fact. So he listens very closely to what people say to one another about him, whether it's good or bad, because it indicates that he lives in the same world they do, and that all his fears about being invisible, impotent, lacking some mysterious dimension that other people have, are groundless.