For there are some vain talkers and deceivers, not Christians, but Christ-betrayers, bearing about the name of Christ in deceit, and “corrupting the word”of the Gospel; while they intermix the poison of their deceit with their persuasive talk, as if they mingled aconite with sweet wine, that so he who drinks, being deceived in his taste by the very great sweetness of the draught, may incautiously meet with his death. One of the ancients gives us this advice, “Let no man be called good who mixes good with evil.” For they speak of Christ, not that they may preach Christ, but that they may reject Christ; and they speak of the law, not that they may establish the law, but that they may proclaim things contrary to it. For they alienate Christ from the Father, and the law from Christ. They also calumniate His being born of the Virgin; they are ashamed of His cross; they deny His passion; and they do not believe His resurrection. They introduce God as a Being unknown; they suppose Christ to be unbegotten; and as to the Spirit, they do not admit that He exists. Some of them say that the Son is a mere man, and that the Father, Son, and Holy Spirit are but the same person, and that the creation is the work of God, not by Christ, but by some other strange power. Be on your guard, [therefore, against such persons, that ye admit not of a snare for your own souls. And act so that your life shall be without offence to all men, lest ye become as “a snare upon a watch-tower, and as a net which is spread out.” For” he that does not heal himself in his own works, is the brother of him that destroys himself.
Epistle of Ignatius to the Trallians.