This document is the preface to Thomas Szasz's book "Cruel Compassion: Psychiatric Control of Society's Unwanted". In the preface, Szasz discusses how people can influence others through either coercion using force, or through non-coercive means like persuasion. He argues that even those who claim to use coercion for altruistic reasons like helping or treatment are ultimately satisfying their own self-interest. Szasz then examines how religious and political authorities have historically justified coercing others in the name of improving or saving them.