Again, in diseases the seventh day is that of the crisis; and the fourteenth, in which nature struggles against the causes of the diseases. And a myriad such instances are adduced by Hermippus of Berytus, in his book _On the Number Seven_, regarding it as holy. And the blessed David delivers clearly to those who know the mystic account of seven and eight, praising thus: “Our years were exercised like a spider. The days of our years in them are seventy years; but if in strength, eighty years. And that will be to reign.”[1158] That, then, we may be taught that the world was originated, and not suppose that God made it in time, prophecy adds: “This is the book of the generation: also of the things in them, when they were created in the day that God made heaven and earth.”[1159] For the expression “when they were created” intimates an indefinite and dateless production. But the expression “in the day that God made,” that is, in and by which God made “all things,” and “without which not even one thing was made,” points out the activity exerted by the Son. As David says, “This is the day which the Lord hath made; let us be glad and rejoice in it;”[1160] that is, in consequence of the knowledge imparted by Him, let us celebrate the divine festival; for the Word that throws light on things hidden, and by whom each created thing came into life and being, is called day. And, in fine, the Decalogue, by the letter _Iota_,[1161] signifies the blessed name, presenting Jesus, who is the Word. _The Fifth Commandment._ Now the fifth in order is the command on the honour of father and mother. And it clearly announces God as Father and Lord. Wherefore also it calls those who know Him sons and gods. The Creator of the universe is their Lord and Father; and the mother is not, as some say, the essence from which we sprang, nor, as others teach, the church, but the divine knowledge and wisdom, as Solomon says, when he terms wisdom “the mother of the just,” and says that it is desirable for its own sake. And the knowledge of all, again, that is lovely and venerable, proceeds from God through the Son. _The Seventh Commandment._ This is followed by the command respecting adultery. Now it is adultery, if one, abandoning the ecclesiastical and true knowledge, and the persuasion respecting God, accedes to false and incongruous opinion, either by deifying any created object, or by making an idol of anything that exists not, so as to overstep, or rather step from, knowledge. And to the Gnostic false opinion is foreign, as the true belongs to him, and is allied with him. Wherefore the noble apostle calls one of the kinds of fornication, idolatry,[1162] in following the prophet, who says: “[My people] hath committed fornication with stock and stone. They have said to the stock, Thou art my father; and to the stone, Thou hast begotten me.”[1163] _The Sixth Commandment._