Tertullian — Prescription against Heretics 30

Where was Marcion then , that shipmaster of Pontus , the zealous student of Stoicism? Where was Valentinus then , the disciple of Platonism? For it is evident that those men lived not so long ago — in the reign of Antoninus for the most part, — and that they at first were believers in the doctrine of the Catholic Church , in the church of Rome under the episcopate of the blessed Eleutherus , until on account of their ever restless curiosity, with which they even infected the brethren, they were more than once expelled. Marcion , indeed, [went] with the two hundred sesterces which he had brought into the church, and, when banished at last to a permanent excommunication , they scattered abroad the poisons of their doctrines.

Afterwards, it is true , Marcion professed repentance, and agreed to the conditions granted to him — that he should receive reconciliation if he restored to the church all the others whom he had been training for perdition: he was prevented, however, by death. It was indeed necessary that there should be heresies ; 1 Corinthians 11:19 and yet it does not follow from that necessity, that heresies are a good thing. As if it has not been necessary also that there should be evil ! It was even necessary that the Lord should be betrayed; but woe to the traitor! Mark 14:21 So that no man may from this defend heresies .

If we must likewise touch the descent of Apelles , he is far from being one of the old school, like his instructor and moulder, Marcion ; he rather forsook the continence of Marcion , by resorting to the company of a woman , and withdrew to Alexandria , out of sight of his most abstemious master. Returning therefrom, after some years, unimproved, except that he was no longer a Marcionite, he clave to another woman , the maiden Philumene (whom we have already mentioned), who herself afterwards became an enormous prostitute. Having been imposed on by her vigorous spirit, he committed to writing the revelations which he had learned of her. Persons are still living who remember them — their own actual disciples and successors — who cannot therefore deny the lateness of their date.

But, in fact, by their own works they are convicted, even as the Lord said. Matthew 7:16 For since Marcion separated the New Testament from the Old, he is (necessarily) subsequent to that which he separated, inasmuch as it was only in his power to separate what was (previously) united. Having then been united previous to its separation, the fact of its subsequent separation proves the subsequence also of the man who effected the separation. In like manner Valentinus , by his different expositions and acknowledged emendations, makes these changes on the express ground of previous faultiness, and therefore demonstrates the difference of the documents. These corrupters of the truth we mention as being more notorious and more public than others.