The Decalogue
At the summit of the moral law stand the ten commandments, which the Bible calls the ten words, the Decalogue. God himself spoke them at Sinai, from the midst of fire and cloud, before a trembling people, and he engraved them with his own finger on two tablets of stone. This detail says everything: these words are not a human wisdom, but the will of God, written to last. They form the heart of the covenant, and divide into two tables, the love of God first, the love of neighbor next, in which all the teaching of Christ will later hold.
The Ten Words, Engraved by God
That God himself engraves these commandments, and not Moses, marks their authority and their permanence: they come from on high, and no one can undo them. Twice Scripture reports them, in Exodus at the foot of Sinai, then in Deuteronomy when Moses says them again to the generation about to enter the promised land, a sign that they are to cross the ages. The Catholic tradition numbers them by distinguishing the duties toward God, borne by the first table, and the duties toward the neighbor, borne by the second. So ordered, the ten words are not a list of scattered prohibitions, but the concrete form of one single movement: to render to God what is his, and to the neighbor what is due to him.
The First Table: The Love of God
The first commandment asks that God alone be adored, and he alone. “You shall have no other gods before my face.” Exodus 20:3 It forbids at the same stroke the making of an idol, a carved image served in place of the living God, for no object, no creature can take the place of the one who made all things. This commandment aims further than the statues of the pagans: it reaches all that man sets at the summit of his life in place of God, money, power, himself. The jealousy God claims is not petty; it is the demand of a love that is not shared.
The second commandment asks that God’s name be honored and not spoken in vain. “You shall not invoke the name of the Lord your God in vain.” Exodus 20:7 The Name, in the Bible, is God himself insofar as he lets himself be called; to treat it lightly, by a false oath, a blasphemy or an empty word, is to fail the very person of God. To respect his Name is to hold it holy on the lips as in the heart.
The third commandment sets apart a day for God, the sabbath, a day of rest and worship. “Remember the sabbath day, to keep it holy… the seventh day is a sabbath for the Lord your God: you shall do no work.” Exodus 20:8-10 This rest recalls that God created the world and rested, and that the life of man is not reduced to his work; it extends to servants, to animals, and to the stranger, making rest a work of mercy. The Christian lives this commandment on Sunday, the day of the Resurrection, on which the new people gathers for the Eucharist. These three words say one same thing: God holds the first place, in the heart, in speech, and in time.
The Second Table: The Love of Neighbor
The second table opens on the family. The fourth commandment asks that one honor his parents, and it is the only one to carry a promise. “Honour your father and your mother, so that your days may be long on the land that the Lord your God is giving you.” Exodus 20:12 It makes the bridge between the two tables, for parents hold before the child the place of God who gives life; through them, the commandment extends to the respect of all lawful authority.
Then come the commandments that protect the neighbor in his most precious goods. The fifth forbids killing, and guards human life as a sacred gift of God, from its beginning to its end. The sixth forbids adultery, and guards the fidelity of marriage, where man and woman give themselves to each other without division. The seventh forbids theft, and guards the goods of the neighbor, recalling that property has a measure and that the necessities of some come before the superfluity of others. The eighth forbids false witness, and guards the truth and the honor of another, for a lying word can destroy a life as surely as a blow.
Finally, the last two commandments reach the very heart, the hidden root of faults, by asking that one not covet what belongs to the neighbor. “You shall not covet your neighbour’s house; you shall not covet your neighbour’s wife, nor his manservant, nor his maidservant, nor his ox, nor his donkey, nor anything that belongs to your neighbour.” Exodus 20:17 Before the act, there is the desire that prepares it; by watching even over this desire, the Law goes further than the codes of men, which judge only acts. It aims at the heart, from which all proceeds.
A Law Inscribed in the Heart
The Decalogue was not engraved on stone alone. It expresses the law that every man already bears within him, that natural law which reason and conscience acknowledge before any revelation: that murder, theft, and lying are evils, and that good is to be done. This is why these commandments hold everywhere and always, for all peoples, and will not pass away. They form also a whole, so that to despise them on one point is to fail the whole. “whoever keeps the whole Law but stumbles on a single point becomes guilty of all of it.” James 2:10 And God promises one day to write them no longer on stone, but within man, by his grace. “I will put my law within them, and I will write it on their hearts; I will be their God, and they shall be my people.” Jeremiah 31:33
Christ and the Commandments
Christ confirms the commandments and uncovers their depth. To the one who asks him the way of life, he answers to keep them, and he names them. “You shall not murder, you shall not commit adultery, you shall not steal, you shall not bear false witness, honor your father and your mother, and you shall love your neighbor as yourself.” Matthew 19:17-19 Then he leads them further, to the hidden source of acts. It no longer suffices not to shed blood, one must tear out the anger and hatred that lead to it. “everyone who is angry with his brother will answer for it before the court.” Matthew 5:21-22 It no longer suffices not to commit adultery, one must guard the gaze and the heart. “everyone who looks at a woman with lust has already committed adultery with her in his heart.” Matthew 5:27-28 Thus the ten words find their fullness in love, which sums them all. “You shall not commit adultery, you shall not commit murder, you shall not steal, you shall not covet, and all the others, are summed up in this word: You shall love your neighbor as yourself.” Romans 13:9 And Christ adds to them his own measure, which becomes the measure of the Christian. “I give you a new commandment: love one another. As I have loved you, so you also must love one another.” John 13:34