43. The author himself, however, when commending these rules, attributes so much value to them that it would appear as if, when they were thoroughly known and duly applied, we should be able to interpret all the obscure passages in the law -- that is, in the sacred books. For he thus commences this very book: "Of all the things that occur to me, I consider none so necessary as to write a little book of rules, and, as it were, to make keys for, and put windows in, the secret places of the law. For there are certain mystical rules which hold the key to the secret recesses of the whole law, and render visible the treasures of truth that are to many invisible. And if this system of rules be received as I communicate it, without jealousy, what is shut shall be laid open, and what is obscure shall be elucidated, so that a man travelling through the vast forest of prophecy shall, if he follow these rules as pathways of light, be preserved from going astray." Now, if he had said, "There are certain mystical rules which hold the key to some of the secrets of the law," or even "which hold the key to the great secrets of the law," and not what he does say, "the secret recesses of the whole law;" and if he had not said "What is shut shall be laid open," but, "Many things that are shut shall be laid open," he would have said what was true, and he would not, by attributing more than is warranted by the facts to his very elaborate and useful work, have led the reader into false expectations. And I have thought it right to say thus much, in order both that the book may be read by the studious (for it is of very great assistance in understanding Scripture), and that no more may be expected from it than it really contains. Certainly it must be read with caution, not only on account of the errors into which the author falls as a man, but chiefly on account of the heresies which he advances as a Donatist. And now I shall briefly indicate what these seven rules teach or advise.