2 And he is the atoning sacrifice for our sins, and not for ours only, but also for the whole world.
3 This is how we know that we know him: if we keep his commandments.
4 One who says, “I know him,” and doesn’t keep his commandments, is a liar, and the truth isn’t in him.
5 But whoever keeps his word, God’s love has most certainly been perfected in him. This is how we know that we are in him:
6 he who says he remains in him ought himself also to walk just like he walked.
7 Brothers, I write no new commandment to you, but an old commandment which you had from the beginning. The old commandment is the word which you heard from the beginning.
8 Again, I write a new commandment to you, which is true in him and in you; because the darkness is passing away, and the true light already shines.