Lord's Day 34

God spoke all these words, saying: 'I am the LORD your God, who brought you out of the land of Egypt, out of the house of slavery. You shall have no other gods before me. You shall not make for yourself a carved image. You shall not take the name of the LORD your God in vain. Remember the Sabbath day, to keep it holy. Honour your father and your mother. You shall not murder. You shall not commit adultery. You shall not steal. You shall not bear false witness against your neighbour. You shall not covet.'

Into two tables. The first has four commandments, teaching us how we ought to live in relation to God. The second has six commandments, teaching us what we owe to our neighbour.

That for the sake of my very salvation I avoid and flee all idolatry, witchcraft, superstition, and prayer to saints or to other creatures. Further, that I rightly come to know the only true God; trust in him alone, submit to him with all humility and patience, expect all good from him only, and love, fear, and honour him with all my heart. In short, that I forsake all creatures rather than do the least thing against his will.

Idolatry is having or inventing something in which to put our trust instead of, or in addition to, the only true God who has revealed himself in his Word.