Early Christian Quotes on Hypocrites and Heretics
Justin Martyr’s Dialog with Trypho (Mid-2nd Century) Chapter 35:
"The fact that there are such men confessing themselves to be Christians, and admitting the crucified Jesus to be both Lord and Christ, yet not teaching His doctrines, but those of the spirits of error, causes us who are disciples of the true and pure doctrine of Jesus Christ, to be more faithful and stedfast in the hope announced by Him. For what things He predicted would take place in His name, these we do see being actually accomplished in our sight. For he said, 'Many shall come in My name, clothed outwardly in sheep's clothing, but inwardly they are ravening wolves." And, 'There shall be schisms and heresies.' And, 'Beware of false prophets, who shall come to you clothed outwardly in sheep's clothing, but inwardly they are ravening wolves.' And, 'Many false Christs and false apostles shall arise, and shall deceive many of the faithful.' There are, therefore, and there were many, my friends, who, coming forward in the name of Jesus, taught both to speak and act impious and blasphemous things; and these are called by us after the name of the men from whom each doctrine and opinion had its origin. (For some in one way, others in another, teach to blaspheme the Maker of all things, and Christ, who was foretold by Him as coming, and the God of Abraham, and of Isaac, and of Jacob, with whom we have nothing in common, since we know them to be atheists, impious, unrighteous, and sinful, and confessors of Jesus in name only, instead of worshippers of Him. Yet they style themselves Christians, just as certain among the Gentiles inscribe the name of God upon the works of their own hands, and partake in nefarious and impious rites.) Some are called Marcians, and some Valentinians, and some Basilidians, and some Saturnilians, and others by other names; each called after the originator of the individual opinion, just as each one of those who consider themselves philosophers, as I said before, thinks he must bear the name of the philosophy which he follows, from the name of the father of the particular doctrine.
Irenaeus’ Against Heresies, Book 5 (Late 2nd Century), Chapter 8, Paragraphs 2-4:
But those who do indeed reject the Spirit's counsel, and are the slaves of fleshly lusts, and lead lives contrary to reason, and who, without restraint, plunge headlong into their own desires, having no longing after the Divine Spirit, do live after the manner of swine and of dogs; these men, [I say], does the apostle very properly term "carnal," because they have no thought of anything else except carnal things…This denotes that, for his own fault, he is likened to cattle, by rivalling their irrational life…
4. Now the law has figuratively predicted all these, delineating man by the [various] animals: whatsoever of these, says [the Scripture], have a double hoof and ruminate, it proclaims as clean; but whatsoever of them do not possess one or other of these [properties], it sets aside by themselves as unclean. Who then are the clean? Those who make their way by faith steadily towards the Father and the Son; for this is denoted by the steadiness of those which divide the hoof; and they meditate day and night upon the words of God, that they may be adorned with good works: for this is the meaning of the ruminants. The unclean, however, are those which do neither divide the hoof nor ruminate; that is, those persons who have neither faith in God, nor do meditate on His words: and such is the abomination of the Gentiles. But as to those animals which do indeed chew the cud, but have not the double hoof, and are themselves unclean, we have in them a figurative description of the Jews, who certainly have the words of God in their mouth, but who do not fix their rooted stedfastness in the Father and in the Son; wherefore they are an unstable generation. For those animals which have the hoof all in one piece easily slip; but those which have it divided are more sure-footed, their cleft hoofs succeeding each other as they advance, and the one hoof supporting the other. In like manner, too, those are unclean which have the double hoof but do not ruminate: this is plainly an indication of all heretics, and of those who do not meditate on the words of God, neither are adorned with works of righteousness; to whom also the Lord says, "Why call ye Me Lord, Lord, and do not the things which I say to you? " For men of this stamp do indeed say that they believe in the Father and the Son, but they never meditate as they should upon the things of God, neither are they adorned with works of righteousness…
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Find more of what the early Christians thought on my Christian History page!