First Reading 1 John 1:5—2:2
5And this is the announcement which we have heard from him, and which we announce to you: that God is light, and in him there is no darkness.
6If we claim that we have fellowship with him, and yet we walk in darkness, then we are lying and not telling the truth.
7But if we walk in the light, just as he also is in the light, then we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.
8If we claim that we have no sin, then we are deceiving ourselves and the truth is not in us.
9If we confess our sins, then he is faithful and just, so as to forgive us our sins and to cleanse us from all iniquity.
10If we claim that we have not sinned, then we make him a liar, and his Word is not in us.
2:1My little sons, this I write to you, so that you may not sin. But if anyone has sinned, we have an Advocate with the Father, Jesus Christ, the Just One.
2And he is the propitiation for our sins. And not only for our sins, but also for those of the whole world.
Catholic Public Domain Version
Read in the CPDV: The whole of 1 John 1The whole of 1 John 2