“If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.” 1 John 1:9 (NASB)
“If WE confess OUR sins.” John did not say, “If YOU confess YOUR sins,” or “If THEY confess THEIR sins.” He said, “WE”–meaning the personal pronouns included John. Believers do commit deeds of unrighteousness; we do things that we know are not pleasing to God, and we omit things that we know would please Him–deeds of godliness that we could do. Even the most consecrated believer sins, and we need to confess our sins. When we do confess our sins, God is faithful and righteous to forgive.
Those of us who have exercised faith in the finished word of Jesus and are covered by His blood are saved by grace–but we still live in the same body we occupied when God saved us by His grace. We sin because we are sinners, even though we are sinners saved by grace; we still have the old nature tagging along. A sheep is not a sheep because it bleats and produces wool: it bleats and produces wool because it is a sheep. A rooster is not a rooster because he crows; he crows because he is a rooster. Sin was our nature when we were born into this world. When we are born again God put within us a new heart but He does not give us new flesh.
If sinners will just confess to God–both sins of omission and commission–God will forgive and abundantly pardon. Forgiveness comes as a result of true confession on the part of the one seeking forgiveness. God is faithful to all His children. He will do exactly what He has promised, He will do all that He has promised, and He will forgive us when we sin if we confess our sin.
God is not only faithful and righteous to forgive our sins, but He is also faithful “to cleanse us from all unrighteousness.” Righteousness is imputed; therefore when God imputes righteousness, all unrighteousness must be removed. Righteousness and unrighteousness cannot abide in the same heart. Ultimately God will remove all stains of guilt from soul, spirit, and body, and we will stand perfect before Him, holy, cleansed, without spot or blemish. Such can be ours only through the shed blood of Jesus and the unsearchable riches of His grace.