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In quotations of the Ten Commandments, the Catholic Church uses the division in Deuteronomy rather than Exodus. In the Catechism of the Catholic Church, topics similar to the commandment are explained.
The First Commandment 
Idolatry, love of possessions and persons over God, superstition, witchcraft, atheism, apostasy, and agnosticism are forbidden. The faithful and clergy may only worship God and Him alone; they may honor, but not set above God, those of His servants who have set an heroic example of fidelity to God.
The Second Commandment 
Cursing, swearing, profanity, obscene speech, rash oaths, blasphemy, and improper use of God's name or the names of the saints are forbidden.
The Third Commandment 
The seventh day is to be observed as a day of rest.
The Fourth Commandment 
Obedience and respect to lawful authority is required, except in the case where one would be required to commit a sin.
The Fifth Commandment 
Murder, suicide, abortion, contraception, euthanasia, and intentional physical injury of oneself or another is prohibited. Unjust wars are also forbidden, and the few cases when a war is undertaken for a just cause are explained.
The Catholic Church teaches that life begins from conception and exists until natural death. Pope Paul VI wrote the encyclical Humanae Vitae on the matter.
The Sixth Commandment 
Adultery, rape, fornication, and homosexuality are forbidden.
The Seventh Commandment 
Theft, vandalism, and damage to the property of another are prohibited. Employers are required to pay just wages.
The Eighth Commandment 
False witness, perjury, detraction, calumny, slander, boasting, bragging, lies, and gossip are forbidden.
The Ninth Commandment 
Lust, impure thoughts, and impure desires are forbidden; purity and modesty are required.
The Tenth Commandment 
Envy is forbidden.
The Eleventh Commandment 
Not believing in the other ten commandments is the same as not believing in God. ==Footnotes==