Catechism of the Catholic Church

Life in Christ 591 A rticle 8 THE EIGHTH COMMANDMENT You shall not bear false witness against your neighbor. 253 It was said to the men of old, “You shall not swear falsely, but shall perform to the Lord what you have sworn.” 254 2464 The eighth commandment forbids misrepresenting the truth in our relations with others. This moral prescription flows from the vocation of the holy people to bear witness to their God who is the truth and wills the truth. Offenses against the truth express by word or deed a refusal to commit oneself to moral up­ rightness: they are fundamental infidelities to God and, in this sense, they undermine the foundations of the covenant. I. L iving in the T ruth 2465 The Old Testament attests that God is the source of all truth. His Word is truth. His Law is truth. His “faithfulness endures to all generations.” 255 Since God is “true,” the members of his people are called to live in the truth. 256 2466 In Jesus Christ, the whole of God’s truth has been made manifest. “Full of grace and truth,” he came as the “light of the world,” he is the Truth. 257 “Whoever believes in me may not remain in darkness.” 258 The disciple of Jesus continues in his word so as to know “the truth [that] will make you free” and that sanctifies. 259 To follow Jesus is to live in “the Spirit of truth,” whom the Father sends in his name and who leads “into all the truth.” 260 To his dis­ ciples Jesus teaches the unconditional love of truth: “Let what you say be simply ‘Yes or No.’” 261 253 Ex 20:16; cf. Deut 5:20. 254 Mt 5:33. 255 Ps 119:90; cf. Prov 8:7; 2 Sam 7:28; Ps 119:142; Lk 1:50. 256 Rom 3:4; cf. Ps 119:30. 257 Jn 1:14; 8:12; cf. 14:6. 258 Jn 12:46. 259 Jn 8:32; cf. 17:17. 260 Jn 16:13. 261 Mt 5:37. 215 2153