THE FIRST COMMANDMENT: I AM THE LORD YOUR GOD,
YOU SHALL NOT HAVE OTHER GODS BEFORE ME

442. What is implied in the affirmation of God: “I am the Lord your God” (Exodus 20:2)?

2083-2094
2133-2134

This means that the faithful must guard and activate the three theological virtues and must avoid sins which are opposed to them. Faith believes in God and rejects everything that is opposed to it, such as, deliberate doubt, unbelief, heresy, apostasy, and schism. Hope trustingly awaits the blessed vision of God and his help, while avoiding despair and presumption. Charity loves God above all things and therefore repudiates indifference, ingratitude, lukewarmness, sloth or spiritual indolence, and that hatred of God which is born of pride.

443. What is the meaning of the words of our Lord, “Adore the Lord your God and worship Him alone” (Matthew 4:10)?

2095-2105
2135-2136 

These words mean to adore God as the Lord of everything that exists; to render to him the individual and community worship which is his due; to pray to him with sentiments of praise, of thanks, and of supplication; to offer him sacrifices, above all the spiritual sacrifice of one’s own life, united with the perfect sacrifice of Christ; and to keep the promises and vows made to him.

444. In what way does a person exercise his or her proper right to worship God in truth and in freedom?

2104-2109
2137 

Every person has the right and the moral duty to seek the truth, especially in what concerns God and his Church. Once  the truth is known, each person he has the right and moral duty to embrace it, to guard it faithfully and to render God authentic worship. At the same time, the dignity of the human person requires that in religious matters no one may be forced to act against conscience nor be restrained, within the just limits of public order, from acting in conformity with conscience, privately or publicly, alone or in association with others.

445. What does God prohibit by his command, “You shall not have other gods before me” (Exodus 20:2)?

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2138-2140 

This commandment forbids:

• Polytheism and idolatry, which divinizes creatures, power, money, or even demons.

• Superstition which is a departure from the worship due to the true God and which also expresses itself in various forms of divination, magic, sorcery and spiritism.

• Irreligion which is evidenced: in tempting God by word or deed; in sacrilege, which profanes sacred persons or sacred things, above all the Eucharist; and in simony, which involves the buying or selling of spiritual things.

• Atheism which rejects the existence of God, founded often on a false conception of human autonomy.

• Agnosticism which affirms that nothing can be known about God, and involves indifferentism and practical atheism.

446. Does the commandment of God, “You shall not make for yourself a graven image” (Exodus 20:3), forbid the cult of images?

2129-2132
2141 

In the Old Testament this commandment forbade any representation of God who is absolutely transcendent. The Christian veneration of sacred images, however, is justified by the incarnation of the Son of God (as taught by the Second Council of Nicea in 787AD) because such veneration is founded on the mystery of the Son of God made man, in whom the transcendent God is made visible. This does not mean the adoration of an image, but rather the veneration of the one who is represented in it: for example, Christ, the Blessed Virgin Mary, the Angels and the Saints.

THE SECOND COMMANDMENT:
YOU SHALL NOT TAKE THE NAME OF THE LORD YOUR GOD IN VAIN

447. How does one respect the holiness of the Name of God?

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One shows respect for the holy Name of God by blessing it, praising it and glorifying it. It is forbidden, therefore, to call on the Name of God to justify a crime. It is also wrong to use the holy Name of God in any improper way as in blasphemy (which by its nature is a grave sin), curses, and unfaithfulness to promises made in the Name of God.

448. Why is a false oath forbidden?

2150-2151
2163-2164 

It is forbidden because one calls upon God who is truth itself to be the witness to a lie.

“Do not swear, whether by the Creator or by any creature, except truthfully, of necessity and with reverence.” (Saint Ignatius of Loyola)

449. What is perjury?

2152-2155

Perjury is to make a promise under oath with the intention of not keeping it or to violate a promise made under oath. It is a grave sin against God who is always faithful to his promises.

THE THIRD COMMANDMENT:
REMEMBER TO KEEP HOLY THE LORD'S DAY

450. Why did God “bless the Sabbath day and declare it sacred” (Exodus 20:11)?

2168-2172
2189

God did so because on the Sabbath day one remembers God’s rest on the seventh day of creation, and also the liberation of Israel from slavery in Egypt and the Covenant which God sealed with his people.

451. How did Jesus act in regard to the Sabbath?

2173

Jesus recognized the holiness of the Sabbath day and with divine authority he gave this law its authentic interpretation: “The Sabbath was made for man, and not man for the sabbath” (Mark 2:27).

452. For what reason has the Sabbath been changed to Sunday for Christians?

2174-2176
2190-2191 

The reason is because Sunday is the day of the Resurrection of Christ. As “the first day of the week” (Mark 16:2) it recalls the first creation; and as the “eighth day”, which follows the sabbath, it symbolizes the new creation ushered in by the Resurrection of Christ. Thus, it has become for Christians the first of all days and of all feasts. It is the day of the Lord in which he with his Passover fulfilled the spiritual truth of the Jewish Sabbath and proclaimed man’s eternal rest in God.

453. How does one keep Sunday holy?

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Christians keep Sunday and other days of obligation holy by participating in the Eucharist of the Lord and by refraining from those activities which impede the worship of God and disturb the joy proper to the day of the Lord or the necessary relaxation of mind and body. Activities are allowed on the Sabbath which are bound up with family needs or with important social service, provided that they do not lead to habits prejudicial to the holiness of Sunday, to family life and to health.

454. Why is the civil recognition of Sunday as a feast day important?

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It is important so that all might be given the real possibility of enjoying sufficient rest and leisure to take care of their religious, familial, cultural and social lives. It is important also to have an opportune time for meditation, for reflection, for silence, for study, and a time to dedicate to good works, particularly for the sick and for the elderly.