1 John 4

Now, to make use of this last proof, caution was required, for many false prophets would assume, and even in the time of the apostle had already assumed, the semblance of having received communications from the Spirit of God, and insinuated themselves among the Christians. It was necessary therefore to put them on their guard, by giving them the sure mark of the real Spirit of God. The first of these was the confession of Jesus come in the flesh. It is not merely to confess that He is come, but to confess Him thus come. The second was that He who really knew God hearkened to the apostles. In this way the writings of the apostles become a touchstone for those who pretend to teach the assembly. All the word is so, doubtless; but I confine myself here to that which is said in this place. The teaching of the apostles is formally a touchstone for all other teaching-I mean that which they themselves taught immediately. If any one tells me that others must explain or develop it to have the truth and certainty of faith, I reply, “You are not of God, for he who is of God hearkens to them; and you would have me not to hearken to them; and whatever may be your pretext, you prevent my doing so.” The denial of Jesus come in the flesh is the spirit of Antichrist. Not to hear the apostles is the provisional and preparatory form of the evil. True Christians had overcome the spirit of error by the Spirit of God who dwelt in them. ...  ... read full writing