4 And these things write we unto you, that your joy may be fulfilled.
5 This then is the promise which we have heard of him and declare unto you, That God is light, and in him is no darkness at all.
6 If we say that we have fellowship with him and walk in darkness, we lie, and do not the truth;
7 But if we walk in the light, as he is in the light, we have communion with him in the midst of us, and the blood of Jesus Christ, his Son cleanses us from all sin.
8 If we say that we have no sin, we deceive ourselves, and there is no truth 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.