42. One Tichonius, who, although a Donatist himself, has written most triumphantly against the Donatists (and herein showed himself of a most inconsistent disposition, that he was unwilling to give them up altogether), wrote a book which he called the Book of Rules, because in it he laid down seven rules, which are, as it were, keys to open the secrets of Scripture. And of these rules, the first relates to the Lord and His body, the second to the twofold division of the Lord's body, the third to the promises and the law, the fourth to species and genus, the fifth to times, the sixth to recapitulation, the seventh to the devil and his body. Now these rules, as expounded by their author, do indeed, when carefully considered, afford considerable assistance in penetrating the secrets of the sacred writings; but still they do not explain all the difficult passages for there are several other methods required which are so far from being embraced in this number of seven, that the author himself explains many obscure passages without using any of his rules; finding, indeed, that there was no need for them, as there was no difficulty in the passage of the kind to which his rules apply. As, for example, he inquires what we are to understand in the Apocalypse by the seven angels of the churches to whom John is commanded to write; and after much and various reasoning, arrives at the conclusion that the angels are the churches themselves. And throughout this long and full discussion, although the matter inquired into is certainly very obscure, no use whatever is made of the rules. This is enough for an example, for it would be too tedious and troublesome to collect all the passages in the canonical Scriptures which present obscurities of such a kind as require none of these seven rules for their elucidation.