Mihaly Csikszentmihalyi in his book Flow, a revolutionary and magically insightful book about work and happiness, writes:
"It is by becoming increasingly complex that the self might be said to grow. Complexity is the result of two braod psychological processes: differentiation and integration. Differentiation implies a movement toward uniqueness, toward separating oneself from others. Integration refers to its opposite: a union with other people, with ideas and entities beyond the self. A complex self is one that succeeds in combining these opposite tendancies."