He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world.
We know that we have come to know him if we obey his commands. The man who says, "I know him," but does not do what he commands is a liar, and the truth is not in him. But if anyone obeys his word, God's love is truly made complete in him.
This is how we know we are in him: Whoever claims to live in him must walk as Jesus did.
Dear friends, I am not writing you a new command but an old one, which you have had since the beginning.