Summary: A classic sermon by St. Augustine.
1. If, Honoratus, a heretic, and a man trusting heretics seemed to me one and the same, I should judge it my duty to remain silent both in tongue and pen in this matter. But now, whereas there is a very great difference between these two: forasmuch as he, in my opinion, is an heretic, who, for the sake of some temporal advantage, and chiefly for the sake of his own glory and pre-eminence, either gives birth to, or follows, false and new opinions; but he, who trusts men of this kind, is a man deceived by a certain imagination of truth and piety. This being the case, I have not thought it my duty to be silent towards you, as to my opinions on the finding and retaining of truth: with great love of which, as you know, we have burned from our very earliest youth: but it is a thing far removed from the minds of vain men, who, having too far advanced and fallen into these corporeal things, think that there is nothing else than what they perceive by those five well-known reporters of the body; and what impressions and images they have received from these, they carry over with themselves, even when they essay to withdraw from the senses; and by the deadly and most deceitful rule of these think that they measure most rightly the unspeakable recesses of truth. Nothing is more easy, my dearest friend, than for one not only to say, but also to think, that he has found out the truth; but how difficult it is in reality, you will perceive, I trust, from this letter of mine. And that this may profit you, or at any rate may in no way harm you, and also all, into whose hands it shall chance to come, I have both prayed, and do pray, unto God; and I hope that it will be so, forasmuch as I am fully conscious that I have undertaken to write it, in a pious and friendly spirit, not as aiming at vain reputation, or trifling display.
2. It is then my purpose to prove to you, if I can, that the Manichees profanely and rashly inveigh against those, who, following the authority of the Catholic Faith, before that they are able to gaze upon that Truth, which the pure mind beholds, are by believing forearmed, and prepared for God Who is about to give them light. For you know, Honoratus, that for no other reason we fell in with such men, than because they used to say, that, apart from all terror of authority, by pure and simple reason, they would lead within to God, and set free from all error those who were willing to be their hearers. For what else constrained me, during nearly nine years, spurning the religion which had been set in me from a child by my parents, to be a follower and diligent hearer of those men, save that they said that we are alarmed by superstition, and are commanded to have faith before reason, but that they urge no one to have faith, without having first discussed and made clear the truth? Who would not be enticed by such promises, especially the mind of a young man desirous of the truth, and further a proud and talkative mind by discussions of certain learned men in the school? Such as they then found me, disdainful forsooth as of old wives' fables, and desirous to grasp and drink in, what they promised, the open and pure Truth? But what reason, on the other hand, recalled me, not to be altogether joined to them, so that I continued in that rank which they call of Hearers, so that I resigned not the hope and business of this world; save that I noticed that they also are rather eloquent and full in refutation of others, than abide firm and sure in proof of what is their own. But of myself what shall I say, who was already a Catholic Christian? Teats which now, after very long thirst, I almost exhausted and dry, have returned to with all greediness, and with deeper weeping and groaning have shaken together and wrung them out more deeply, that so there might flow what might be enough to refresh me affected as I was, and to bring back hope of life and safety. What then shall I say of myself? You, not yet a Christian, who, through encouragement from me, execrating them greatly as you did, were hardly led to believe that you ought to listen to them and make trial of them, by what else, I pray you, were you delighted, call to mind, I entreat you, save by a certain great presumption and promise of reasons? But because they disputed long and much with very great copiousness and vehemence concerning the errors of unlearned men, a thing which I learned too late at length to be most easy for any moderately educated man; if even of their own they implanted in us any thing, we thought that we were obliged to retain it, insomuch as there fell not in our way other things, wherein to acquiesce. So they did in our case what crafty fowlers are wont to do, who set branches smeared with bird-lime beside water to deceive thirsty birds. For they fill up and cover anyhow the other waters which are around, or fright them from them by alarming devices, that they may fall into their snares, not through choice, but want.