Scripture the Criterion by Which Truth and Heresy are Distinguished
The knowledge of the truth among us from what is already believed, produces faith in what is not yet believed; which [faith] is, so to speak, the essence of demonstration. But, as appears, no heresy has at all ears to hear what is useful, but opened only to what leads to pleasure. Since also, if one of them would only obey the truth, he would be healed.
Now the cure of self-conceit (as of every ailment) is threefold: the ascertaining of the cause, and the mode of its removal; and thirdly, the training of the soul, and the accustoming it to assume a right attitude to the judgments come to. For, just like a disordered eye, so also the soul that has been darkened by unnatural dogmas cannot perceive distinctly the light of truth, but even overlooks what is before it.
They say, then, that in muddy water eels are caught by being blinded. And just as knavish boys bar out the teacher, so do these shut out the prophecies from their Church, regarding them with suspicion by reason of rebuke and admonition. In fact, they stitch together a multitude of lies and figments, that they may appear acting in accordance with reason in not admitting the Scriptures. So, then, they are not pious, inasmuch as they are not pleased with the divine commands, that is, with the Holy Spirit. And as those almonds are called empty in which the contents are worthless, not those in which there is nothing; so also we call those heretics empty, who are destitute of the counsels of God and the traditions of Christ; bitter, in truth, like the wild almond, their dogmas originating with themselves, with the exception of such truths as they could not, by reason of their evidence, discard and conceal.
As, then, in war the soldier must not leave the post which the commander has assigned him, so neither must we desert the post assigned by the Word, whom we have received as the guide of knowledge and of life. But the most have not even inquired, if there is one that we ought to follow, and who this is, and how he is to be followed. For as is the Word, such also must the believer's life be, so as to be able to follow God, who brings all things to end from the beginning by the right course.
But when one has transgressed against the Word, and thereby against God; if it is through becoming powerless in consequence of some impression being suddenly made, he ought to see to have the impressions of reasons at hand. And if it is that he has become “common,” as the Scripture says, in consequence of being overcome the habits which formerly had sway by over him, the habits must be entirely put a stop to, and the soul trained to oppose them. And if it appears that conflicting dogmas draw some away, these must be taken out of the way, and recourse is to be had to those who reconcile dogmas, and subdue by the charm of the Scriptures such of the untutored as are timid, by explaining the truth by the connection of the Testaments.
But, as appears, we incline to ideas founded on opinion, though they be contrary, rather than to the truth. For it is austere and grave. Now, since there are three states of the soul— ignorance, opinion, knowledge— those who are in ignorance are the Gentiles, those in knowledge, the true Church, and those in opinion, the Heretics. Nothing, then, can be more clearly seen than those, who know, making affirmations about what they know, and the others respecting what they hold on the strength of opinion, as far as respects affirmation without proof.
They accordingly despise and laugh at one another. And it happens that the same thought is held in the highest estimation by some, and by others condemned for insanity. And, indeed, we have learned that voluptuousness, which is to be attributed to the Gentiles, is one thing; and wrangling, which is preferred among the heretical sects, is another; and joy, which is to be appropriated to the Church, another; and delight, which is to be assigned to the true Gnostic, another. And as, if one devote himself to Ischomachus, he will make him a farmer; and to Lampis, a mariner; and to Charidemus, a military commander; and to Simon, an equestrian; and to Perdices, a trader; and to Crobylus, a cook; and to Archelaus, a dancer; and to Homer, a poet; and to Pyrrho, a wrangler; and to Demosthenes, an orator; and to Chrysippus, a dialectician; and to Aristotle, a naturalist; and to Plato, a philosopher: so he who listens to the Lord, and follows the prophecy given by Him, will be formed perfectly in the likeness of the teacher— made a god going about in flesh.
Accordingly, those fall from this eminence who follow not God whither He leads. And He leads us in the inspired Scriptures.
Though men's actions are ten thousand in number, the sources of all sin are but two, ignorance and inability. And both depend on ourselves; inasmuch as we will not learn, nor, on the other hand, restrain lust. And of these, the one is that, in consequence of which people do not judge well, and the other that, in consequence of which they cannot comply with right judgments. For neither will one who is deluded in his mind be able to act rightly, though perfectly able to do what he knows; nor, though capable of judging what is requisite, will he keep himself free of blame, if destitute of power in action. Consequently, then, there are assigned two kinds of correction applicable to both kinds of sin: for the one, knowledge and clear demonstration from the testimony of the Scriptures; and for the other, the training according to the Word, which is regulated by the discipline of faith and fear. And both develop into perfect love. For the end of the Gnostic here is, in my judgment, twofold,— partly scientific contemplation, partly action.
Would, then, that these heretics would learn and be set right by these notes, and turn to the sovereign God! But if, like the deaf serpents, they listen not to the song called new, though very old, may they be chastised by God, and undergo paternal admonitions previous to the Judgment, till they become ashamed and repent, but not rush through headlong unbelief, and precipitate themselves into judgment.
For there are partial corrections, which are called chastisements, which many of us who have been in transgression incur, by falling away from the Lord's people. But as children are chastised by their teacher, or their father, so are we by Providence. But God does not punish, for punishment is retaliation for evil. He chastises, however, for good to those who are chastised, collectively and individually.
I have adduced these things from a wish to avert those, who are eager to learn, from the liability to fall into heresies, and out of a desire to stop them from superficial ignorance, or stupidity, or bad disposition, or whatever it should be called. And in the attempt to persuade and lead to the truth those who are not entirely incurable, I have made use of these words. For there are some who cannot bear at all to listen to those who exhort them to turn to the truth; and they attempt to trifle, pouring out blasphemies against the truth, claiming for themselves the knowledge of the greatest things in the universe, without having learned, or inquired, or laboured, or discovered the consecutive train of ideas,— whom one should pity rather than hate for such perversity.
But if one is curable, able to bear (like fire or steel) the outspokenness of the truth, which cuts away and burns their false opinions, let him lend the ears of the soul. And this will be the case, unless, through the propensity to sloth, they push truth away, or through the desire of fame, endeavour to invent novelties. For those are slothful who, having it in their power to provide themselves with proper proofs for the divine Scriptures from the Scriptures themselves, select only what contributes to their own pleasures. And those have a craving for glory who voluntarily evade, by arguments of a diverse sort, the things delivered by the blessed apostles and teachers, which are wedded to inspired words; opposing the divine tradition by human teachings, in order to establish the heresy. For, in truth, what remained to be said— in ecclesiastical knowledge I mean— by such men, Marcion, for example, or Prodicus, and such like, who did not walk in the right way? For they could not have surpassed their predecessors in wisdom, so as to discover anything in addition to what had been uttered by them; for they would have been satisfied had they been able to learn the things laid down before.
Source: The Stromata, or Miscellanies (New Advent)