And we can be sure that we know him if we obey his commandments.
If someone claims, “I know God,” but doesn’t obey God’s commandments, that person is a liar and is not living in the truth.
But those who obey God’s word truly show how completely they love him. That is how we know we are living in him.
Those who say they live in God should live their lives as Jesus did.
Dear friends, I am not writing a new commandment for you; rather it is an old one you have had from the very beginning. This old commandment—to love one another—is the same message you heard before.
Yet it is also new. Jesus lived the truth of this commandment, and you also are living it. For the darkness is disappearing, and the true light is already shining.
If anyone claims, “I am living in the light,” but hates a fellow believer, that person is still living in darkness.
Anyone who loves a fellow believer is living in the light and does not cause others to stumble.
But anyone who hates a fellow believer is still living and walking in darkness. Such a person does not know the way to go, having been blinded by the darkness.
I am writing to you who are God’s children because your sins have been forgiven through Jesus.
I am writing to you who are mature in the faith because you know Christ, who existed from the beginning. I am writing to you who are young in the faith because you have won your battle with the evil one.