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Roman Catechism
Why Adultery Is Expressly Mentioned
But the reason why adultery is expressly forbidden is because in addition to the turpitude which it shares with other kinds of incontinence, it adds the sin of injustice, not only against our neighbour, but also against civil society.
Again it is certain that he who abstains not from other sins against chastity, will easily fall into the crime of adultery. By the prohibition of adultery, therefore, we at once see that every sort of immodesty and impurity by which the body is defiled is prohibited. Nay, that every inward thought against chastity is forbidden by this Commandment is clear, as well from the very force of the law, which is evidently spiritual, as also from these words of Christ the Lord: You have heard that it was said to them of old: “Thou shalt not commit adultery.” But I say to you, that whosoever shall look on a woman to lust after her, hath already committed adultery with her in his heart.
These are the points which we have deemed proper matter for public instruction of the faithful. The pastor, however, should add the decrees of the Council of Trent against adulterers, and those who keep harlots and concubines, omitting many other species of immodesty and lust, of which each individual is to be admonished privately, as circumstances of time and person may require.