78. How do unfaithful husbands and wives treat this holy institution?
They despise it, and thus bring down upon themselves the judgment of God.
Heb. 13:4. Whoremongers and adulterers God will judge.
79. Repeat some passages from Scripture in which impurity is forbidden?
Be not deceived: neither fornicators, nor adulterers, nor effeminate, nor abusers of themselves with mankind, shall inherit the kingdom of God. 1 Cor. 6:9, 10.
Jesus says: I say unto you, that whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart. Matt. 5:28.
Let no corrupt communication proceed out of your mouth! Eph. 4:29.
80. Why is this sin so fearful?
Because it affects both soul and body more than any other sin.