1 John 4:2-4

New Revised Standard Version Catholic Edition

² By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God, ³ and every spirit that does not confess Jesus^[a] is not from God. And this is the spirit of the antichrist, of which you have heard that it is coming; and now it is already in the world. ⁴ Little children, you are from God, and have conquered them; for the one who is in you is greater than the one who is in the world.