Catechism of the Catholic Church: Article 7:"From Thence He Will Come Again"
II. To Judge the Living and the Dead
678. Following in the steps of the prophets and John the Baptist, Jesus announced the judgment of the Last Day in his preaching. Then will the conduct of each one and the secrets of hearts be brought to light. Then will the culpable unbelief that counted the offer of God's grace as nothing be condemned. Our attitude to our neighbor will disclose acceptance or refusal of grace and divine love. On the Last Day Jesus will say: "Truly I say to you, as you did it to one of the least of these my brethren, you did it to me."
679. Christ is Lord of eternal life. Full right to pass definitive judgment on the works and hearts of men belongs to him as redeemer of the world. He "acquired" this right by his cross. The Father has given "all judgment to the Son". Yet the Son did not come to judge, but to save and to give the life he has in himself. By rejecting grace in this life, one already judges oneself, receives according to one's works, and can even condemn oneself for all eternity by rejecting the Spirit of love.
In Brief
680. Christ the Lord already reigns through the Church, but all the things of this world are not yet subjected to him. The triumph of Christ's kingdom will not come about without one last assault by the powers of evil.
681. On Judgment Day at the end of the world, Christ will come in glory to achieve the definitive triumph of good over evil which, like the wheat and the tares, have grown up together in the course of history.
682. When he comes at the end of time to judge the living and the dead, the glorious Christ will reveal the secret disposition of hearts and will render to each man according to his works, and according to his acceptance or refusal of grace.
Notes
549 Rom 14:9.
550 Eph 1:20-22.
551 Eph 1:10; cf. 4:10; 1 Cor 15:24,27-28.
552 Cf. Eph 1:22.
553 LG 3; 5; cf. Eph 4:11-13.
554 1 Jn 2:18; cf. 1 Pet 4:7.
555 LG 48 § 3; cf. 1 Cor 10:11.
556 Cf. Mk 16:17-18,20.
557 Lk 21:27; cf. Mt 25:31.
558 Cf. 2 Thess 2:7.
559 LG 48 § 3; cf. 2 Pet 3:13; Rom 8:19-22; 1 Cor 15:28.
560 Cf. 1 Cor 11:26; 2 Pet 3:11-12.
561 1 Cor 16:22; Rev 22:17,20.
562 Cf. Acts 1:6-7.
563 Cf. Isa 11:1-9.
564 Cf. Acts 1:8; 1 Cor 7:26; Eph 5:16; 1 Pet 4:17.
565 Cf. Mt 25:1, 13; Mk 13:33-37; 1 Jn 2:18; 4:3; 1 Tim 4:1.
566 Cf. Rev 22:20.
567 Acts 1:7; Cf. Mk 13:32.
568 Cf. Mt 24:44; 1 Thess 5:2; 2 Thess 2:3-12.
569 Rom 11:20-26; cf. Mt 23:39.
570 Acts 3:19-21.
571 Rom 11:15.
572 Rom 11:12, 25; cf. Lk 21:24.
573 Eph 4:13; 1 Cor 15:28.
574 Cf. Lk 18:8; Mt 24:12.
575 Cf. Lk 21:12; Jn 15:19-20.
576 Cf. 2 Thess 2:4-12; 1 Thess 5:2-3; 2 Jn 7; 1 Jn 2:18,22.
577 Cf. DS 3839.
578 Pius XI, Divini Redemptoris , condemning the "false mysticism" of this "counterfeit of the redemption of the lowly"; cf. GS 20-21.
579 Cf. Rev 19:1-9.
580 Cf Rev 13:8; 20:7-10; 21:2-4.
581 Cf. Rev 20:12; 2 Pet 3:12-13.
582 Cf. Dan 7:10; Joel 3-4; Mal 3:19; Mt 3:7-12.
583 Cf Mk 12:38-40; Lk 12:1-3; Jn 3:20-21; Rom 2:16; 1 Cor 4:5.
584 Cf. Mt 11:20-24; 12:41-42.
585 Cf. Mt 5:22; 7:1-5.
586 Mt 25:40.
587 Jn 5:22; cf. 5:27; Mt 25:31; Acts 10:42; 17:31; 2 Tim 4:1.
588 Cf. Lk 21:12; Jn 15:19-20.
589 Cf. Jn 3:18; 12:48; Mt 12:32; 1 Cor 3:12-15; Heb 6:4-6; 10:26-31.