CCC 1454 The reception of this sacrament ought to be prepared for by an examination of conscience made in the light of the Word of God. The passages best suited to this can be found in the Ten Commandments, the moral catechesis of the Gospels and the apostolic letters, such as the Sermon on the Mount and the apostolic teachings.1

CCC 1473 The forgiveness of sin and restoration of communion with God entail the remission of the eternal punishment of sin, but temporal punishment of sin remains. While patiently bearing sufferings and trials of all kinds and, when the day comes, serenely facing death, the Christian must strive to accept this temporal punishment of sin as a grace. He should strive by works of mercy and charity, as well as by prayer and the various practices of penance, to put off completely the “old man” and to put on the “new man.”2

CCC 1695 “Justified in the name of the Lord Jesus Christ and in the Spirit of our God,”3 “sanctified. .. [and] called to be saints,”4 Christians have become the temple of the Holy Spirit.5 This “Spirit of the Son” teaches them to pray to the Father6 and, having become their life, prompts them to act so as to bear “the fruit of the Spirit”7 by charity in action. Healing the wounds of sin, the Holy Spirit renews us interiorly through a spiritual transformation.8 He enlightens and strengthens us to live as “children of light” through “all that is good and right and true.”9

CCC 2475 Christ’s disciples have “put on the new man, created after the likeness of God in true righteousness and holiness.”10 By “putting away falsehood,” they are to “put away all malice and all guile and insincerity and envy and all slander.”11

1 Cf. Mt 5-7; Rom 12-15; 1 Cor 12-13; Gal 5; Eph 4-6; etc.
2 Eph 4:22, 24.
3 2 Cor 6:11.
4 1 Cor 1:2.
5 Cf. 1 Cor 6:19.
6 Cf. Gal 4:6.
7 Gal 5:22, 25.
8 Cf. Eph 4:23.
9 Eph 5:8, 9.
10 Eph 4:24.
11 Eph 4:25; 1 Pet 2:1.