12. For as soon as it became plain to me that Faustus was ignorant in those arts in which I had believed him eminent, I began to despair of his being able to clarify and explain all these perplexities that troubled me--though I realized that such ignorance need not have affected the authenticity of his piety, if he had not been a Manichean. For their books are full of long fables about the sky and the stars, the sun and the moon; and I had ceased to believe him able to show me in any satisfactory fashion what I so ardently desired: whether the explanations contained in the Manichean books were better or at least as good as the mathematical explanations I had read elsewhere. But when I proposed that these subjects should be considered and discussed, he quite modestly did not dare to undertake the task, for he was aware that he had no knowledge of these things and was not ashamed to confess it. For he was not one of those talkative people--from whom I had endured so much--who undertook to teach me what I wanted to know, and then said nothing. Faustus had a heart which, if not right toward thee, was at least not altogether false toward himself; for he was not ignorant of his own ignorance, and he did not choose to be entangled in a controversy from which he could not draw back or retire gracefully. For this I liked him all the more. For the modesty of an ingenious mind is a finer thing than the acquisition of that knowledge I desired; and this I found to be his attitude toward all abstruse and difficult questions.
13. Thus the zeal with which I had plunged into the Manichean system was checked, and I despaired even more of their other teachers, because Faustus who was so famous among them had turned out so poorly in the various matters that puzzled me. And so I began to occupy myself with him in the study of his own favorite pursuit, that of literature, in which I was already teaching a class as a professor of rhetoric among the young Carthaginian students. With Faustus then I read whatever he himself wished to read, or what I judged suitable to his bent of mind. But all my endeavors to make further progress in Manicheism came completely to an end through my acquaintance with that man. I did not wholly separate myself from them, but as one who had not yet found anything better I decided to content myself, for the time being, with what I had stumbled upon one way or another, until by chance something more desirable should present itself. Thus that Faustus who had entrapped so many to their death--though neither willing nor witting it--now began to loosen the snare in which I had been caught. For thy hands, O my God, in the hidden design of thy providence did not desert my soul; and out of the blood of my mother's heart, through the tears that she poured out by day and by night, there was a sacrifice offered to thee for me, and by marvelous ways thou didst deal with me. For it was thou, O my God, who didst it: for "the steps of a man are ordered by the Lord, and he shall choose his way." How shall we attain salvation without thy hand remaking what it had already made?