6. Chap. IV.

There is in this another mystery, ¹ and you are not to be distressed if perhaps it be not so readily perceived by you, because of your being less versed in such studies; nor are you to think me any better than you, because I learned these things in early years: for the Lord saith, "Let him that glorieth glory in this, that he understandeth and knoweth Me, that I am the Lord." ² Some men who give attention to such studies, have investigated many things concerning the numbers and motions of the heavenly bodies. And those who have done this most ably have found that the waxing and waning of the moon are due to the turning of its globe, and not to any such actual addition to or diminution of its substance as is supposed by the foolish Manichaeans, who say that as a ship is filled, so the moon is filled with a fugitive portion of the Divine Being, which they, with impious heart and lips, do not hesitate to believe and to declare to have become mingled with the rulers of darkness, and contaminated with their pollution. And they account for the waxing of the moon by saying that it takes place when that lost portion of the Deity, being purified from contamination by great labours, escaping from the whole world, ³ and from all foul abominations, ⁴ is restored to the Deity, who mourns till it returns; that by this the moon is filled up till the middle of the month, and that in the latter half of the month this is poured back into the sun as into another ship. Amid these execrable blasphemies, they have never succeeded in devising any way of explaining why the moon in the beginning or end of its brightness shines with its light in the shape of a horn, or why it begins at the middle of the month to wane, and does not go on full until it pour back its increase into the sun.