My little children, I am writing these [things] to you in order that you may not sin. And if anyone sins, we have an advocate with the Father, Jesus Christ the righteous [one],
and he is the propitiation for our sins, and not for ours only, but also for [the sins of] the whole world.
And by this we know that we have come to know him, if we keep his commandments.
The one who says "I have come to know him," and does not keep his commandments is a liar, and the truth is not in this person.
But whoever keeps his word, truly in this person the love of God has been perfected. By this we know that we are in him.
The one who says [that he] resides in him ought also to walk just as that one walked.
Dear friends, I am not writing a new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the message which you have heard.
Again, I am writing a new commandment to you, which is true in him and in you, because the darkness is passing away and the true light already is shining.
The one who says [he] is in the light and hates his brother is in the darkness until now.
The one who loves his brother resides in the light, and [there] is no cause for stumbling in him.
But the one who hates his brother is in the darkness, and walks in the darkness, and does not know where he is going, because the darkness has blinded his eyes.