²⁰ We know also that the Son of God has come^(A) and has given us understanding,^(B) so that we may know him who is true.^(C) And we are in him who is true by being in his Son Jesus Christ. He is the true God and eternal life.^(D)

¹⁷ And if Christ has not been raised, your faith is futile; you are still in your sins.^(A)

⁶ Whoever claims to live in him must live as Jesus did.^(A)

² This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh^(A) is from God,^{(B) 3} but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist,^(C) which you have heard is coming and even now is already in the world.^(D)