But yet who bade that Manichaeus write on these things also, skill in which was no element of piety? For Thou hast said to man, Behold piety and wisdom; of which he might be ignorant, though he had perfect knowledge of these things; but these things, since, knowing not, he most impudently dared to teach, he plainly could have no knowledge of piety. For it is vanity to make profession of these worldly things even when known; but confession to Thee is piety. Wherefore this wanderer to this end spake much of these things, that convicted by those who had truly learned them, it might be manifest what understanding he had in the other abstruser things. For he would not have himself meanly thought of, but went about to persuade men, "That the Holy Ghost, the Comforter and Enricher of Thy faithful ones, was with plenary authority personally within him." When then he was found out to have taught falsely of the heaven and stars, and of the motions of the sun and moon (although these things pertain not to the doctrine of religion), yet his sacrilegious presumption would become evident enough, seeing he delivered things which not only he knew not, but which were falsified, with so mad a vanity of pride, that he sought to ascribe them to himself, as to a divine person.

For when I hear any Christian brother ignorant of these things, and mistaken on them, I can patiently behold such a man holding his opinion; nor do I see that any ignorance as to the position or character of the corporeal creation can injure him, so long as he doth not believe any thing unworthy of Thee, O Lord, the Creator of all. But it doth injure him, if he imagine it to pertain to the form of the doctrine of piety, and will yet affirm that too stiffly whereof he is ignorant. And yet is even such an infirmity, in the infancy of faith, borne by our mother Charity, till the new-born may grow up unto a perfect man, so as not to be carried about with every wind of doctrine. But in him who in such wise presumed to be the teacher, source, guide, chief of all whom he could so persuade, that whoso followed him thought that he followed, not a mere man, but Thy Holy Spirit; who would not judge that so great madness, when once convicted of having taught any thing false, were to be detested and utterly rejected? But I had not as yet clearly ascertained whether the vicissitudes of longer and shorter days and nights, and of day and night itself, with the eclipses of the greater lights, and whatever else of the kind I had read of in other books, might be explained consistently with his sayings; so that, if they by any means might, it should still remain a question to me whether it were so or no; but I might, on account of his reputed sanctity, rest my credence upon his authority.