3 We know that we have come to know him if we keep his commands.
4 Whoever says, “I know him,” but does not do what he commands is a liar, and the truth is not in that person.
5 But if anyone obeys his word, love for God is truly made complete in them. This is how we know we are in him:
6 Whoever claims to live in him must live as Jesus did.
7 Dear friends, I am not writing you a new command but an old one, which you have had since the beginning. This old command is the message you have heard.
8 Yet I am writing you a new command; its truth is seen in him and in you, because the darkness is passing and the true light is already shining.
9 Anyone who claims to be in the light but hates a brother or sister is still in the darkness.