'It must be understood that man consists of two parts: essence and personality. Essence in man is what is his own, personality is what is not his own. Not his own means what has come from outside, what he has learned, or reflects, all traces of exterior impressions left in the memory and in the sensations, all words and movements that have been learned, all feelings created by imitation - all this is not his own, all this is personality.
A small child has no personality yet. He is what he really is. He is essence. His desires, tastes, likes, dislikes, express his being such as it is.
Essence is the truth in man; personality is the false. But in proportion as personality grows, essence manifests itself more and more rarely, and more and more feebly, and it very often happens that essence stops its growth at a very early age and grows no further. It happens very often that the essence of a grown up man, even that of a very intellectual and, in the accepted meaning of the word, highly educated man, stops on the level of a child of five or six.' - P D Ouspensky