This extract is taken from Wikipedia.
Self-actualization is a term that has been used in various psychology theories, often in slightly different ways (e.g., Goldstein, Maslow, Rogers). The term was originally introduced by the organismic theorist Kurt Goldstein for the motive to realize one’s full potential. In his view, it is the master motive—indeed, the only real motive a person has, all others being merely manifestations of it. However, the concept was brought to prominence in Abraham Maslow’s hierarchy of needs theory as the final level of psychological development that can be achieved when all basic and mental needs are fulfilled and the “actualisation” of the full personal potential takes place.