8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. 10 If we say that we have not sinned, we make Him a liar, and His word is not in us. (1 John 1:8–10, NKJV)
To confess means to acknowledge, “to say the same thing as another, i.e. to agree with, assent…to concede” (Thayer, 446). Confessing our sins requires that we agree with God that we have transgressed His truth; we have sinned. God’s assurance of forgiveness to Christians “if we confess our sins” is bookended with “if we say that we have no sin” (v. 8) and “If we say that we have not sinned” (v. 10). We must acknowledge our sins to ourselves before we can and ever will properly confess them to God (Psa. 32:3-4). We must come to ourselves like the prodigal (Lk. 15:17). God’s word describes this process as godly sorrow producing repentance that leads to salvation (2 Cor. 7:10). With contrite hearts, we admit our sins to ourselves, and with repentance toward God, we confess our sins to Him (Lk. 15:18-19). With such a confession of sins, we fall before the throne of grace seeking mercy, and God keeps His word to cleanse our defilement (1 Jno. 1:9; Psa. 32:5; 51:3-4, 7-12, 17). John says four things happen when we deny our sin: 1) We deceive ourselves, 2) The truth is not in us, 3) We make God a liar, and 4) His word is not in us. God is faithful to forgive us when we trust Him and confess our sins to Him.