Bede : For many deceivers have gone out into the world, etc. This can also be understood concerning the heretics who indeed confess Jesus Christ incarnate but do not rightly perceive some part of his faith, such as his true flesh, true soul, true divinity, true Father God, true Holy Spirit, omnipotent God, or any other thing that true faith confesses. It can also be taken concerning the Jews, who wholly deny Jesus Christ, swear that Christ has not yet come in the flesh for the salvation of the world, but expect the Antichrist to come for their destruction. — Commentary on the Catholic Epistles Irenaeus : All, therefore, are outside of the [Christian] dispensation, who, under pretext of knowledge, understand that Jesus was one, and Christ another, and the Only-begotten another, from whom again is the Word, and that the Saviour is another, whom these disciples of error allege to be a production of those who were made Aeons in a state of degeneracy. Such men are to outward appearance sheep; for they appear to be like us, by what they say in public, repeating the same words as we do; but inwardly they are wolves. Their doctrine is homicidal, conjuring up, as it does, a number of gods, and simulating many Fathers, but lowering and dividing the Son of God in many ways. These are they against whom the Lord has cautioned us beforehand; and His disciple, in his Epistle already mentioned, commands us to avoid them, when he says: "For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist. Take heed to them, that ye lose not what ye have wrought." — Against Heresies Book III Oecumenius : This is the seducer and an antichrist. Look to yourselves, that we do not lose those things we worked for, but that we may receive a full reward. "This is the seducer and an antichrist." With this, it must be understood for a more perfect explanation, therefore "who do not confess that," as it should be properly added, "This is the seducer and an antichrist." Without this, the discourse will be disordered and independent, namely passing from the plural to the singular. This is, John says, an antichrist and seducer. However, by saying, "Those who do not confess that Jesus Christ has come in the flesh," he reveals that he is speaking of those who reject the Lord's coming: since the Lord himself, saying, "Many will come in my name," (Matt. 24:5) does not speak of the first coming, but of the second: Nevertheless, in truth, those who reject the second also reject the first. For if he who came in the flesh also promised a second coming, certainly he who rejects the second also rejects the first: for if he believes that he has come, he would also consider the promise of the one who has come to be certain: but if he despises the promise, it cannot be said in any way that he believes even in the first. Therefore, I believe the beloved disciple used the word "to come," not "to have come," so that he might comprehend those denying both of the Lord's coming in the flesh. Therefore, John instructed them to beware of these: and he adds the reason: "Lest by adhering to them, you lose what you have previously worked for, but receive your full reward without any weakness." But perhaps someone might say in such matters: "What if I do not believe in Christ's coming in the flesh, yet I lead a life in good works, can I not be counted among the pious and religious through these works, nor receive a reward for them?" The Apostle first removes this objection by saying: Let no one think that by rejecting the coming of the Lord in the flesh, one can either achieve the perfect justice owed to the faithful through works or be regarded as a worshiper of God at all. — Commentary on 2 John Oecumenius : Nor for any other reason was it given from the beginning, John says, except that you might walk in it, revolving and turning the same things in the higher and lower realms: and indeed by love urging them towards inseparability, and that they should not be led away by seducers, who were already walking in the world and rejecting the coming of the Lord in the flesh: but by this that he admonishes to walk according to the Lord's command which was from the beginning, revealing the erroneous opinion of the heretics which is recent: and exhorting that by embracing the command which was from the beginning, they should not be led away by their deceit. For Christ also commanded the disciples about these seducers, saying: "Many will come in my name", saying: I am Christ, and they will deceive many. "Therefore do not follow them." (Luke 21:8) Therefore, keeping these commands, John says, he commands that you should not be deceived, but that you should consider him who hides these things to be "an antichrist". — Commentary on 2 John Polycarp of Smyrna : "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." — Epistle to the Philippians 7 Tertullian : And how is it that he enjoins duties which belong to our God, and enjoins them to be offered to none other than our God? Either contend that the devil works with our God, or else let the Paraclete be held to be Satan. But you affirm it is "a human Antichrist: "for by this name heretics are called in John. And how is it that, whoever he is, he has in (the name of) our Christ directed these duties toward our Lord; whereas withal antichrists have (ever) gone forth (professedly teaching) towards God, (but) in opposition to our Christ? On which side, then, do you think the Spirit is confirmed as existing among us; when He commands, or when He approves, what our God has always both commanded and approved? But you again set up boundary-posts to God, as with regard to grace, so with regard to discipline; as with regard to gifts, so, too, with regard to solemnities: so that our observances are supposed to have ceased in like manner as His benefits; and you thus deny that He still continues to impose duties, because, in this case again, "the Law and the prophets (were) until John. — On Fasting