1 John 4:4

²  Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:

³  And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.

⁴  Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.

⁵  They are of the world: therefore speak they of the world, and the world heareth them.

⁶  We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.