 When we confess our sin to God, he is faithful, he will forgive every time, and he is just, because Jesus already paid our sin debt, to forgive us and to cleanse us from all unrighteousness. We cannot say that we are in fellowship with our Savior if we are walking in the darkness of sin. We cannot say that we are in fellowship with the Lord if we don't recognize the reality of the presence of our sin nature.