Psychoanalysis, which interprets the human being as a socialized being, and the psychic apparatus as essentially developed and determined through the relationship of the individual to society, must consider it a duty to participate in the investigation of sociological problems to the extent the human being or his/her psyche plays any part at all.

"Psychoanalyse und Soziologie" (1929); published as "Psychoanalysis and Sociology" as translated by Mark Ritter, in Critical Theory and Society : A Reader (1989) edited by S. E. Bronner and D. M. Kellner.