1John 4:2

“"For whosoever does not confess that Jesus Christ has come in the flesh, is antichrist;" and whosoever does not confess the testimony of the cross, is of the devil; and whosoever perverts the oracles of the Lord to his own lusts, and says that there is neither a resurrection nor a judgment, he is the first-born of Satan. Wherefore, forsaking the vanity of many, and their false doctrines, let us return to the word which has been handed down to us from the beginning; "watching unto prayer," and persevering in fasting; beseeching in our supplications the all-seeing God "not to lead us into temptation," as the Lord has said: "The spirit truly is willing, but the flesh is weak."”

“John, moreover, brands that man as "a liar" who "denieth that Jesus is the Christ; "whilst on the other hand he declares that "every one is born of God who believeth that Jesus is the Christ." Wherefore he also exhorts us to believe in the name of His (the Father's, ) Son Jesus Christ, that "our fellowship may be with the Father, and with His Son Jesus Christ.”

“There remains then the test by which it is to be proved to be the Spirit of God. He has indeed set down a sign, and this, be-like, difficult: let us see, however. We are to recur to that charity; it is that which teacheth us, because it is the unction. However, what saith he here? "Prove the spirits, whether they be from God: because many false prophets have gone out into this world." Now there are all heretics and all schismatics. How then am I to prove the spirit? He goes on: "In this is known the Spirit of God." Wake up the ears of your heart. We were at a loss; we were saying, Who knows? who discerns? Behold, he is about to tell the sign.”

“"Hereby is known the Spirit of God: every spirit that confesseth that Jesus Christ is come in the flesh is of God: and every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is the antichrist, of whom ye have heard that he should come; and even now already is he in this world." Our ears, so to say, are on the alert for discerning of the spirits; and we have been told something, such that thereby we discern not a whit the more. For what saith he? "Every spirit that confesseth that Jesus Christ came in the flesh, is of God." Then is the spirit that is among the heretics, of God, seeing they "confess that Jesus Christ came in the flesh"?”

“Aye, here perchance they lift themselves up against us, and say: Ye have not the Spirit from God; but we confess "that Jesus Christ came in the flesh:" but the apostle here hath said that those have not the Spirit of God, who confess not "that Jesus Christ came in the flesh." Ask the Arians: they confess "that Jesus Christ came in the flesh:" ask the Eunomians; they confess "that Jesus Christ came in the flesh:" ask the Macedonians; they confess "that Jesus Christ came in the flesh:" put the question to the Cataphryges; they confess "that Jesus Christ came in the flesh:" put it to the Novatians; they confess "that Jesus Christ came in the flesh." Then have all these heresies the Spirit of God? Are they then no false prophets? Is there then no deception there, no seduction there? Assuredly they are antichrists; for "they went out from us, but were not of us."”

“What are we to do then? By what to discern them? Be very attentive; let us go together in heart, and knock. Charity herself keeps watch; for it is none other than she that shall knock, she also that shall open: anon ye shall understand in the name of our Lord Jesus Christ. Already ye have heard that it was said above, "Whoso denieth that Jesus Christ is come in the flesh, the same is an antichrist." There also we asked, Who denies? because neither do we deny, nor do those deny. And we found that some do in their deeds deny; and we brought testimony from the apostle, who saith, "For they confess that they know God, but in their deeds deny Him." Thus then let us now also make the enquiry in the deeds not in the tongue.”

“What is the spirit that is not from God? That "which denieth that Jesus Christ is come in the flesh." And what is the spirit that is from God? That "which confesseth that Jesus Christ is come in the flesh." Who is he that confesseth that Jesus Christ is come in the flesh? Now, brethren, to the mark! let us look to the works, not stop at the noise of the tongue. Let us ask why Christ came in the flesh, so we get at the persons who deny that He is come in the flesh. If thou stop at tongues, why, thou shalt hear many a heresy confessing that Christ is come in the flesh: but the truth convicteth those men. Wherefore came Christ in the flesh? Was He not God? Is it not written of Him, "In the beginning was the Word, and the Word was with God, and the Word was God"? Was it not He that did feed angels, is it not He that doth feed angels? Did He not in such sort come hither, that He departed not thence? Did He not in such sort ascend, that He forsook not us?”

“Wherefore then came He in the flesh? Because it behooved us to have the hope of resurrection shown unto us. God He was, and in flesh He came; for God could not die, flesh could die; He came then in the flesh, that He might die for us. But how died He for us? "Greater charity than this hath no man, that a man lay down his life for his friends." Charity therefore brought Him to the flesh. Whoever therefore has not charity denies that Christ is come in the flesh. Here then do thou now question all heretics. Did Christ come in the flesh? "He did come; this I believe, this I confess." Nay, this thou deniest. "How do I deny? Thou hearest that I say it!" Nay, I convict thee of denying it. Thou sayest with the voice, deniest with the heart; sayest in words, deniest in deeds.”

“"How," sayest thou, "do I deny in deeds?" Because the end for which Christ came in the flesh, was, that He might die for us. He died for us, because therein He taught much charity. "Greater charity than this hath no man, that a man lay down his life for his friends." Thou hast not charity, seeing thou for thine own honor dividest unity. Therefore by this understand ye the spirit that is from God. Give the earthen vessels a tap, put them to the proof, whether haply they be cracked and give a dull sound: see whether they ring full and clear, see whether charity be there. Thou takest thyself away from the unity of the whole earth, thou dividest the Church by schisms, thou rendest the Body of Christ. He came in the flesh, to gather in one, thou makest an outcry to scatter abroad.”

“This then is the Spirit of God, which saith that Jesus is come in the flesh, which saith, not in tongue but in deeds, which saith, not by making a noise but by loving. And that spirit is not of God, which denies that Jesus Christ is come in the flesh - denies, here also, not in tongue but in life; not in words but in deeds. It is manifest therefore by what we may know the brethren. Many within are in a sort within; but none without except he be indeed without.”

“Nay, and that ye may know that he has referred the matter to deeds, he saith, "And every spirit, qui solvit Christum, which does away with Christ that He came in the flesh, is not of God." A doing away in deeds is meant. What has he shown thee? "That denieth:" in that he saith, "doeth away" (or, "unmaketh"). He came to gather in one, thou comest to unmake. Thou wouldest pull Christ's members asunder. How can it be said that thou deniest not that Christ is come in the flesh, who rendest asunder the Church of God which He hath gathered together? Therefore thou goest against Christ; thou art an antichrist. Be thou within, or be thou without, thou art an antichrist: only, when thou art within, thou art hidden; when thou art without, thou art made manifest. Thou unmakest Jesus and deniest that He came in the flesh; thou art not of God.”

“It is characteristic of the antichrist, who is coming into the world and has indeed already come, to deny Christ through false prophets and spirits by saying that he never came in the flesh. There are many different heretics, but on this point they all speak with the same voice. To confess that Jesus Christ has come in the flesh does not just mean that he has come in his own flesh but that he enters my flesh as well.”

“In this is known the Spirit of God, etc. Confession in this place is understood not only as the Catholic faith but also as the good operation which is done through charity. Otherwise, some heretics confess, many schismatics, many false Catholics, that Jesus Christ has come in the flesh, but they deny their confession by their deeds, not having charity. For charity brought the Son of God to the flesh. And therefore, whoever does not have charity denies that He has come in the flesh, such a one is convicted of not having the Spirit from God. But He is the Spirit of God, who says that Jesus Christ has come in the flesh, who says it not with the tongue, but with deeds, not by sounding, but by loving.”

“Next: every spirit, that is, everyone bearing the title of prophet or apostle, who confesses the Lord Jesus as having come in the flesh, is from God, and whoever does not confess this is not from God, but his dignity is from the antichrist, which you have also heard. The Apostle a little above (1 John 2:18) said that many antichrists have appeared in the world, that is, forerunners of the antichrist. And the confession of Christ's coming in the flesh must be made not only with the tongue, but also in deeds, as the Apostle Paul says: "we always carry about in the body the dying... of Jesus, that the life also of Jesus might be made manifest in our body" (2 Cor. 4:10). So then, whoever has Jesus working within him, has died to the world, no longer lives for the world but for Christ, and bears Him not only in Christ's flesh but also in his own, that one is from God. But whoever does not live for Christ but for himself and for the world, that is, for worldly pleasures, that one is not from God. Therefore Paul again says: "if there are envy, strife, and divisions among you, are you not fleshly? And are you not walking according to human custom?" (1 Cor. 3:3). He who walks according to human custom does not have the Spirit of Christ; and whoever does not have the Spirit of Christ, that is, does not live according to the teaching of Christ, that one is not Christ's.”

“By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God; and every spirit that does not confess Jesus is not from God. This is the spirit of the Antichrist, of which you heard that it is coming, and now it is already in the world. "every spirit that confesses." Every spirit, whether of prophecy or the dignity of apostleship, that Jesus Christ has come in the flesh, is from God: but whatever does not confess this is not from God, but this dignity is of the Antichrist, of which you have heard. When? From these words which he said a little earlier, that many antichrists are in the world, (1 Jn. 2:18) that is, forerunners of the Antichrist. Furthermore, he says that the confession of the Lord's coming is not made by the tongue, but by works. How? As blessed Paul says: "Always carrying in the body the death of Jesus, so that the life of Jesus may also be made evident in our body." (2 Cor. 4:10) Therefore, whoever has Jesus working in him, and is dead to the world, no longer lives to the world but to Christ, and carries Him not only in the flesh of Christ, but also in his own, he is from God. But whoever lives not for Christ, but for the world, that is, for the pleasures of the world, such a person is not from God. Therefore, Paul says, "When there are contentions and factions among you, are you not carnal and walking according to man?" (1 Cor. 3:3) He who walks according to the flesh does not have the spirit of Christ (Rom. 8:9); that is, he who does not live according to Christ, in such a way that he has died to the world, this one is not of Christ. "and now it is already in the world." In the world, John says, the Antichrist is already present, not physically, but because of the presence of those who prepare the way for him, namely, false prophets, false apostles, and heretics. This Antichrist, however, will be a man who conveys Satan, exalted against all that is called God or divinity. (2 Thess. 2:4) Therefore, he will also reject the worship of idols, which he signified as gods: moreover, by adding this: Every divine being also signifies Christianity: and he will only attempt to show himself as God.”