If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
Ver. 9. If we confess] Homo agnoscit, Deus ignoscit. Man acknowledges, God forgives. And Confessio peccati est vomitus sordium animae. Confession of sin is the vomit of the filthy soul. (Aug.) Judah (his name signifies confession) got the kingdom from Reuben. No man was ever kept out of God's kingdom for his confessed badness; many are for their supposed goodness; as those justitiaries in the former verse, whose hearts are big swollen with high conceit of themselves; and whose lips are held close by the devil; who knows well there is no way to purge the sick soul but upwards.
He is faithful] And yet Bellarmine saith that he cannot find in all the book of God any promise made to confession of sin to God. (De Justific. i. 21.) He might have seen (besides other places not a few)Proverbs 28:13; Psalms 32:5, &c., that this very text is a most heavenly promise of mercy to those that confess heartily, and not hollowly. The word faithful also refers to God's promises, as just doth to the blood of Christ (the ransom received) whereby the saints are cleansed, and it stands not with God's justice to demand the same debt twice, viz. of the surety and of the debtor.
From all unrighteousness] All without exception; why then should we put in conditions, and as it were interline God's covenant? He is a sin pardoning God, Nehemiah 9:31; no God like him for that in heaven and earth, Micah 7:18; he multiplieth pardon, as we multiply sin, Isaiah 55:7; he doth it freely, for his own sake, naturally, Exodus 34:6; constantly,Psalms 130:4, and here. The blood of Jesus Christ cleanseth (not, he hath cleansed or will cleanse, but he doth it) daily and duly, constantly and continually. This should be as a perpetual picture in our hearts.