1920s Alfred Adler claims there is only one motivating force behind all our behavior and experience: the striving for perfection.
1935 Henry Murray develops the Thematic Apperception Test, which measures personality and motivation.
1950s Kurt Goldstein defines self-actualization as the tendency to actualize, as much as possible, the organism’s individual capacities, and proclaims that the drive to self-actualize is the only drive that determines the life of an individual.
1974 Fritz Perls says that every living thing “has only one inborn goal—to actualize itself as it is.”
Throughout recorded history, ...