19 Now, first of all, men professing a devout knowledge of divine things, in matters where the truth preached by Evangelists and Apostles showed the way, ought to have laid aside the intricate questions of a crafty philosophy, and rather to have followed after the faith which rests in God: because the sophistry of a syllogistical question easily disarms a weak understanding of the protection of its faith, since treacherous assertion lures on the guileless defender, who tries to support his case by enquiry into facts, till at last it robs him, by means of his own enquiry, of his certainty; so that the answerer no longer retains in his consciousness a truth which by his admission he has surrendered.
For what answer accommodates itself so well to the questioner's purpose, as the admission on our part, when we are asked, “Does anything exist before it is born?” that that which is born, did not previously exist? For it is contrary both to nature and to necessary reason that a thing which already exists should be born: since a thing must needs be born in order that it may come to be, and not because it already existed. But when we have made this concession, because it is rightly made, we lose the certainty of our faith, and being ensnared we fall in with their impious and unchristian designs.
Source: On the Trinity (New Advent)