Jesus Christ taught important principles on marriage. For instance, he said: “‘A man will leave his father and his mother and will stick to his wife, and the two will be one flesh’

(Matthew 19:5, 6) At least two important principles stand out.

“THE TWO WILL BE ONE FLESH.” Marriage is the most intimate union humans can have, and love can protect it against infidelity​—that is, the husband or wife becoming “one body” with someone other than his or her spouse. (1 Corinthians 6:16; Hebrews 13:4) Unfaithfulness shatters trust and can wreck the marriage. If children are involved, they may be emotionally traumatized, feeling unloved, insecure, or even resentful.