Chapter 22 — Part II: The Sacraments — Matrimony
Section 28. A third reason has been added, as a consequence of the fall of our first parents. On account of the loss of original innocence the passions began to rise in rebellion against right reason; and man, conscious of his own frailty and unwilling to fight the battles of the flesh, is supplied by marriage with an antidote by which to avoid sins of lust. For fear of fornication, says the Apostle, let every man have his own wife, and let every woman have her own husband; and a little after, having recommended to married persons a temporary abstinence from the marriage debt, to give themselves to prayer, he adds: Return together again, lest Satan tempt you for your incontinency.