CCC 2517

The heart is the seat of moral personality: "Out of the heart come evil thoughts, murder, adultery, fornication...."³⁰⁴ Mt 15:19. The struggle against carnal covetousness entails purifying the heart and practicing temperance:

Remain simple and innocent, and you will be like little children who do not know the evil that destroys man's life.³⁰⁵ Pastor Hermae, Mandate 2, 1: PG 2, 916PG — Patrologia Graeca (Migne).