2517 The heart is the seat of moral personality: "Out of the heart come evil thoughts, murder, adultery, fornication...." 305 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. 306
Notes:
305 Mt 15:19.306 Pastor Hermae, Mandate 2, 1: PG 2, 916.