1 John 4:2-4

Revised Standard Version Catholic Edition

² By this you know the Spirit of God: every spirit which confesses that Jesus Christ has come in the flesh is of God, ³ and every spirit which does not confess Jesus is not of God. This is the spirit of antichrist, of which you heard that it was coming, and now it is in the world already. ⁴ Little children, you are of God, and have overcome them; for he who is in you is greater than he who is in the world.