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).