On account of the heresies, therefore, the toil of discovery must be undertaken; but we must not at all abandon [the truth]. For, on fruit being set before us, some real and ripe, and some made of wax, as like the real as possible, we are not to abstain from both on account of the resemblance. But by the exercise of the apprehension of contemplation, and by reasoning of the most decisive character, we must distinguish the true from the seeming.

And as, while there is one royal highway, there are many others, some leading to a precipice, some to a rushing river or to a deep sea, no one will shrink from travelling by reason of the diversity, but will make use of the safe, and royal, and frequented way; so, though some say this, some that, concerning the truth, we must not abandon it; but must seek out the most accurate knowledge respecting it. Since also among garden-grown vegetables weeds also spring up, are the husbandmen, then, to desist from gardening?

Having then from nature abundant means for examining the statements made, we ought to discover the sequence of the truth. Wherefore also we are rightly condemned, if we do not assent to what we ought to obey, and do not distinguish what is hostile, and unseemly, and unnatural, and false, from what is true, consistent, and seemly, and according to nature. And these means must be employed in order to attain to the knowledge of the real truth.

This pretext is then, in the case of the Greeks, futile; for those who are willing may find the truth. But in the case of those who adduce unreasonable excuses, their condemnation is unanswerable. For whether do they deny or admit that there is such a thing as demonstration? I am of opinion that all will make the admission, except those who take away the senses. There being demonstration, then, it is necessary to condescend to questions, and to ascertain by way of demonstration by the Scriptures themselves how the heresies erred, and how in the truth alone and in the ancient church is both the exactest knowledge, and the truly best set of principles (αἵρεσις).

Now, of those who diverge from the truth, some attempt to deceive themselves alone, and some also their neighbours. Those, then, who are called (δοξόσοφοι) wise in their own opinions, who think that they have found the truth, but have no true demonstration, deceive themselves in thinking that they have reached a resting-place. And of whom there is no inconsiderable multitude, who avoid investigations for fear of refutations, and shun instruction for fear of condemnation. But those who deceive those who seek access to them are very astute; who, aware that they know nothing, yet darken the truth with plausible arguments.

But, in my opinion, the nature of plausible arguments is of one character, and that of true arguments of another. And we know that it is necessary that the appellation of the heresies should be expressed in contradistinction to the truth; from which the Sophists, drawing certain things for the destruction of men, and burying them in human arts invented by themselves, glory rather in being at the head of a School than presiding over the Church.

CHAPTER XVI.
SCRIPTURE THE CRITERION BY WHICH TRUTH AND HERESY ARE DISTINGUISHED.

But those who are ready to toil in the most excellent pursuits, will not desist from the search after truth, till they get the demonstration from the Scriptures themselves.

There are certain criteria common to men, as the senses; and others that belong to those who have employed their wills and energies in what is true,—the methods which are pursued by the mind and reason, to distinguish between true and false propositions.

Now, it is a very great thing to abandon opinion, by taking one’s stand between accurate knowledge and the rash wisdom of opinion, and to know that he who hopes for everlasting rest knows also that the entrance to it is toilsome “and strait.” And let him who has once received the gospel, even in the very hour in which he has come to the knowledge of salvation, “not turn back, like Lot’s wife,” as is said; and let him not go back either to his former life, which adheres to the things of sense, or to heresies. For they form the character, not knowing the true God. “For he that loveth father or mother more than me,” the Father and Teacher of the truth, who regenerates and creates anew, and nourishes the elect soul, “is not worthy of me”—He means, to be a son of God and a disciple of God, and at the same time also to be a friend, and of kindred nature. “For no man who looks back, and puts his hand to the plough, is fit for the kingdom of God.”[1301]