Self-actualization (a term originated by Kurt Goldstein) is the instinctual need of a human to make the most of their unique abilities. Maslow described it as follows:

Self Actualization is the intrinsic growth of what is already in the organism, or more accurately, of what the organism is. (Psychological Review, 1949)

A musician must make music, the artist must paint, a poet must write, if he is to be ultimately at peace with himself. What a man can be, he must be. This need we may call self-actualization. (Motivation and Personality, 1954.)
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