This is a concise presentation of the essential positions of the Marxist-Leninist philosophical theory of personality. Its consequences to modern psychiatry are discussed. Particular emphasis has been placed on establishing practical relations with mental patients and creating optimum conditions for promoting the distinctive qualities or characteristics of persons within the framework of therapy. Also discussed by the author in his present paper are questions associated with pathogenesis. Integration of clinical and sociopsychological research into the development of psychoses is considered necessary.