1Jn 1, 8-10 He will forgive our sins and cleanse us

(1Jn 1, 8-10) He will forgive our sins and cleanse us
[8] If we say, "We are without sin," we deceive ourselves, and the truth is not in us. [9] If we acknowledge our sins, he is faithful and just and will forgive our sins and cleanse us from every wrongdoing. [10] If we say, "We have not sinned," we make him a liar, and his word is not in us.

(CCC 1425) "You were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and in the Spirit of our God" (1 Cor 6:11). One must appreciate the magnitude of the gift God has given us in the sacraments of Christian initiation in order to grasp the degree to which sin is excluded for him who has "put on Christ" (Gal 3:27). But the apostle John also says: "If we say we have no sin, we deceive ourselves, and the truth is not in us" (1 Jn 1:8). And the Lord himself taught us to pray: "Forgive us our trespasses" (Cf. Lk 11:4; Mt 6:12), linking our forgiveness of one another's offenses to the forgiveness of our sins that God will grant us. (CCC 1847) "God created us without us: but he did not will to save us without us" (St. Augustine, Sermo 169, 11, 13: PL 38, 923). To receive his mercy, we must admit our faults. "If we say we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just, and will forgive our sins and cleanse us from all unrighteousness" (1 Jn 8-9). (CCC 827) "Christ, 'holy, innocent, and undefiled,' knew nothing of sin, but came only to expiate the sins of the people. The Church, however, clasping sinners to her bosom, at once holy and always in need of purification, follows constantly the path of penance and renewal" (LG 8 § 3; Cf. UR 3; 6; Heb 2:17; 7:26; 2 Cor 5:21). All members of the Church, including her ministers, must acknowledge that they are sinners (Cf. 1 Jn 1:8-10). In everyone, the weeds of sin will still be mixed with the good wheat of the Gospel until the end of time (Cf. Mt 13:24-30). Hence the Church gathers sinners already caught up in Christ's salvation but still on the way to holiness: The Church is therefore holy, though having sinners in her midst, because she herself has no other life but the life of grace. If they live her life, her members are sanctified; if they move away from her life, they fall into sins and disorders that prevent the radiation of her sanctity. This is why she suffers and does penance for those offenses, of which she has the power to free her children through the blood of Christ and the gift of the Holy Spirit (Paul VI, CPG § 19).