Chapter 29 — Part III: The Decalogue — The Sixth Commandment
Section 1. The Position Of This Commandment In The Decalogue Is Most Suitable — The bond between man and wife is one of the closest, and nothing can be more gratifying to both than to know that they are objects of mutual and special affection. On the other hand, nothing inflicts deeper anguish than to feel that the legitimate love which one owes the other has been transferred elsewhere. Rightly, then, and in its natural order, is the Commandment which protects human life against the hand of the murderer, followed by that which forbids adultery and which aims to prevent anyone from injuring or destroying by such a crime the holy and honourable union of marriage -- a union which is generally the source of ardent affection and love.