Keeping Christ's Commandments

2 My little children, I am writing these things to you so that you will not sin. But if anyone does sin, we have an advocate with the Father—Jesus Christ, the righteous one. 2 He is the atoning sacrifice for our sins, and not for ours only, but also for the sins of the whole world. 3 By this we can be sure that we know him: if we keep his commandments. 4 Whoever says, “I know him” but does not keep his commandments is a liar, and the truth is not in him. 5 But whoever keeps his word, truly in him the love of God has been perfected. By this we know that we are in him: 6 Whoever says he abides in him ought to walk just as he walked.