The ninth commandment forbids cultivating thoughts and desires connected to actions forbidden by the sixth commandment.
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2517. The heart is the seat of moral personality: "Out of the heart come evil thoughts, murder, adultery, fornication...."304 The struggle against carnal covetousness entails purifying the heart and practicing temperance:
Remain simple and innocent, and you will be like little children who do not know the evil that destroys man's life.305
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2518. The sixth beatitude proclaims, "Blessed are the pure in heart, for they shall see God."306 "Pure in heart" refers to those who have attuned their intellects and wills to the demands of God's holiness, chiefly in three areas: charity;307 chastity or sexual rectitude;308 love of truth and orthodoxy of faith.309 There is a connection between purity of heart, of body, and of faith:
The faithful must believe the articles of the Creed "so that by believing they may obey God, by obeying may live well, by living well may purify their hearts, and with pure hearts may understand what they believe."310
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2519. The "pure in heart" are promised that they will see God face to face and be like him.311 Purity of heart is the precondition of the vision of God. Even now it enables us to see according to God, to accept others as "neighbors"; it lets us perceive the human body - ours and our neighbor's - as a temple of the Holy Spirit, a manifestation of divine beauty.
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2531. Purity of heart will enable us to see God: it enables us even now to see things according to God.
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2532. Purification of the heart demands prayer, the practice of chastity, purity of intention and of vision.
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Christ’s Return: What Do We Know and What Do We Hope (2 Thessalonians 2:1-12)?
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What is the message of Nahum 1:7-8 about God’s faithfulness in the midst of chaos?
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