Ten Commandments, Lesson 8: You Shall Not Commit Adultery

Introduction
 
As the commandments we have looked at before, there is much more to this commandment than meets the eye. You can see why the Pharisees had an inflated view of their standing before God. They believed they were fulfilling the commandments because they had not killed anyone, robbed a bank, or run off with a neighbor’s wife.
 
Missing from their understanding were the issues of the heart that God cares much about. In fact, in 1 Samuel, God revealed that humans look at the outside things that characterize a person, while God cares more about the heart. It’s not just the Pharisees who were guilty of this. Christians too, to use Jesus’ satiric imagery, strain out gnats and swallow camels. Christians may think that because they have outwardly behaved themselves by not having sexual intercourse with another person, yet the epidemic of Christians (men especially) who watch pornography is shameful and astounding. If this isn’t a lustful desire of the heart, it’s hard to imagine what is.

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Faithfulness in Marriage

The Heidelberg Catechism: Lord’s Day 41

108. Question: What does the seventh commandment teach us?

 Answer: That all unchastity is cursed by God.[1] We must therefore detest it from the heart[2] and live chaste and disciplined lives, both within and outside of holy marriage.[3]

 [1] Lev. 18:30; Eph. 5:3-5. [2] Jude 22, 23. [3] I Cor. 7:1-9; I Thess. 4:3-8; Heb. 13:4.

 109. Question: Does God in this commandment forbid nothing more than adultery and similar shameful sins?

 Answer: Since we, body and soul, are temples of the Holy Spirit, it is God’s will that we keep ourselves pure and holy. Therefore He forbids all unchaste acts, gestures, words, thoughts, desires,[1] and whatever may entice us to unchastity.[2]

 [1] Matt. 5:27-29; I Cor. 6:18-20; Eph. 5:3, 4. [2] I Cor. 15:33; Eph. 5:18.