19 With those exceptions, including also the testimonies quoted from the Old Testament, you profess, to use the words of Faustus, to receive all the rest, especially the mystic nailing to the cross, emblematic of the wounds of the soul in its passion; as also the sound moral precepts of Jesus, and the whole of His immortal discourse, which sets forth especially the distinction of the two natures, and therefore must undoubtedly be His. Your design clearly is to deprive Scripture of all authority, and to make every man's mind the judge what passage of Scripture he is to approve of, and what to disapprove of.
This is not to be subject to Scripture in matters of faith, but to make Scripture subject to you. Instead of making the high authority of Scripture the reason of approval, every man makes his approval the reason for thinking a passage correct. If, then, you discard authority, to what, poor feeble soul, darkened by the mists of carnality, to what, I beseech you, will you betake yourself? Set aside authority, and let us hear the reason of your beliefs. Is it by a logical process that your long story about the nature of God concludes necessarily with this startling announcement, that this nature is subject to injury and corruption?
And how do you know that there are eight continents and ten heavens, and that Atlas bears up the world, and that it hangs from the great world-holder, and innumerable things of the same kind? Who is your authority? Manichæus, of course, you will say. But, unhappy being, this is not sight, but faith. If, then, you submit to receive a load of endless fictions at the bidding of an obscure and irrational authority, so that you believe all those things because they are written in the books which your misguided judgment pronounces trustworthy, though there is no evidence of their truth, why not rather submit to the authority of the Gospel, which is so well founded, so confirmed, so generally acknowledged and admired, and which has an unbroken series of testimonies from the apostles down to our own day, that so you may have an intelligent belief, and may come to know that all your objections are the fruit of folly and perversity; and that there is more truth in the opinion that the unchangeable nature of God should take part of mortality, so as, without injury to itself from this union, to do and to suffer not feignedly, but really, whatever it behooved the mortal nature to do and to suffer for the salvation of the human race from which it was taken, than in the belief that the nature of God is subject to injury and corruption, and that, after suffering pollution and captivity, it cannot be wholly freed and purified, but is condemned by a supreme divine necessity to eternal punishment in the mass of darkness?
Source: Reply to Faustus the Manichaean (New Advent)