2534 The tenth commandment unfolds and completes the ninth, which is concerned with concupiscence of the flesh. It forbids coveting the goods of another, as the root of theft, robbery, and fraud, which the seventh commandment forbids. "Lust of the eyes" leads to the violence and injustice forbidden by the fifth commandment.319 Avarice, like fornication, originates in the idolatry prohibited by the first three prescriptions of the Law.320 The tenth commandment concerns the intentions of the heart; with the ninth, it summarizes all the precepts of the Law.
2535 The sensitive appetite leads us to desire pleasant things we do not have, e.g., the desire to eat when we are hungry or to warm ourselves when we are cold. These desires are good in themselves; but often they exceed the limits of reason and drive us to covet unjustly what is not ours and belongs to another or is owed to him.
2536 The tenth commandment forbids greed and the desire to amass earthly goods without limit. It forbids avarice arising from a passion for riches and their attendant power. It also forbids the desire to commit injustice by harming our neighbor in his temporal goods:
2537 It is not a violation of this commandment to desire to obtain things that belong to one's neighbor, provided this is done by just means. Traditional catechesis realistically mentions "those who have a harder struggle against their criminal desires" and so who "must be urged the more to keep this commandment":
2538 The tenth commandment requires that envy be banished from the human heart. When the prophet Nathan wanted to spur King David to repentance, he told him the story about the poor man who had only one ewe lamb that he treated like his own daughter and the rich man who, despite the great number of his flocks, envied the poor man and ended by stealing his lamb.323 Envy can lead to the worst crimes.324 "Through the devil's envy death entered the world":325
2539 Envy is a capital sin. It refers to the sadness at the sight of another's goods and the immoderate desire to acquire them for oneself, even unjustly. When it wishes grave harm to a neighbor it is a mortal sin:
2540 Envy represents a form of sadness and therefore a refusal of charity; the baptized person should struggle against it by exercising good will. Envy often comes from pride; the baptized person should train himself to live in humility:
2541 The economy of law and grace turns men's hearts away from avarice and envy. It initiates them into desire for the Sovereign Good; it instructs them in the desires of the Holy Spirit who satisfies man's heart.
The God of the promises always warned man against seduction by what from the beginning has seemed "good for food . . . a delight to the eyes . . . to be desired to make one wise."330
2542 The Law entrusted to Israel never sufficed to justify those subject to it; it even became the instrument of "lust."331 The gap between wanting and doing points to the conflict between God's Law which is the "law of my mind," and another law "making me captive to the law of sin which dwells in my members."332
2543 "But now the righteousness of God has been manifested apart from law, although the law and the prophets bear witness to it, the righteousness of God through faith in Jesus Christ for all who believe."333 Henceforth, Christ's faithful "have crucified the flesh with its passions and desires"; they are led by the Spirit and follow the desires of the Spirit.334
2544 Jesus enjoins his disciples to prefer him to everything and everyone, and bids them "renounce all that [they have]" for his sake and that of the Gospel.335 Shortly before his passion he gave them the example of the poor widow of Jerusalem who, out of her poverty, gave all that she had to live on.336 The precept of detachment from riches is obligatory for entrance into the Kingdom of heaven.
2545 All Christ's faithful are to "direct their affections rightly, lest they be hindered in their pursuit of perfect charity by the use of worldly things and by an adherence to riches which is contrary to the spirit of evangelical poverty."337
2546 "Blessed are the poor in spirit."338 The Beatitudes reveal an order of happiness and grace, of beauty and peace. Jesus celebrates the joy of the poor, to whom the Kingdom already belongs:339
2547 The Lord grieves over the rich, because they find their consolation in the abundance of goods.341 "Let the proud seek and love earthly kingdoms, but blessed are the poor in spirit for theirs is the Kingdom of heaven."342 Abandonment to the providence of the Father in heaven frees us from anxiety about tomorrow.343 Trust in God is a preparation for the blessedness of the poor. They shall see God.
2548 Desire for true happiness frees man from his immoderate attachment to the goods of this world so that he can find his fulfillment in the vision and beatitude of God. "The promise [of seeing God] surpasses all beatitude. . . . In Scripture, to see is to possess. . . . Whoever sees God has obtained all the goods of which he can conceive."344
2549 It remains for the holy people to struggle, with grace from on high, to obtain the good things God promises. In order to possess and contemplate God, Christ's faithful mortify their cravings and, with the grace of God, prevail over the seductions of pleasure and power.
2550 On this way of perfection, the Spirit and the Bride call whoever hears them345 to perfect communion with God:
317 Ex 20:17; Deut 5:21.