If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness.
(61) “Faithful” and “just” are nearly of the same import, having both a regard to God’s promise, only the latter affords a stronger or an additional ground of confidence, inasmuch as the fulfillment of God’s gracious promise is set forth as an act of justice. So that the penitent has here two of God’s attributes, faithfulness and justice, to encourage and support his faith. 