First Catechism Questions:
FCQ. 95 - What is the seventh commandment? "You shall not commit adultery."
FCQ. 96 - What does the seventh commandment teach you? To be pure in heart, language, and conduct.
Shorter Catechism Questions:
SCQ. 82 - Is any man able perfectly to keep the commandments of God? No mere man, since the fall, is able in this life perfectly to keep the commandments of God, but does daily break them in thought, word, and deed.
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