The thesis is developed that the clinician must reject modern ethical relativism (values are matters of culturally-determined preferences) and accept humanistic ethics in the study of personality whether viewed theoretically or therapeutically. Philosophical, religious, socioeconomic, anthropological, psychological, and modern analytic clinical data are integrated to support the emergence of a value theory which makes the norms of ethical conduct inherent in all human nature, in man's striving for achievement of his potentialities, in productiveness the by-products of which are happiness and health, and the violation of which results in mental and emotional disintegration. Emphasis is placed upon modern analytic theory in relation to humanistic and authoritarian ethics.