"Every one who looks at a woman lustfully has already committed adultery with her in his heart. The ninth commandment warns against lust and carnal concupiscence The struggle against carnal lust involves purifying the heart and practicing temperance. Purity of the heart enable us to see God: it enables us even now to see things according to God. Purification of the heart demands prayer, the practice of chastity, purity of intention and of vision. Purity of heart requires the modesty which is patience, decency and discretion. Modesty protects the intimate centre of the person."