over, with any one to whom consanguinity bids us render respect? The sexual intercourse of man and woman, then, is in the case of mortals a kind of seed-bed of the city; but while the earthly city needs for its population only generation, the heavenly needs also regeneration to rid it of the taint of generation. Whether before the deluge there was any bodily or visible sign of regeneration, such as was afterwards enjoined upon Abraham when he was circumcised, or what kind of sign it was, the sacred history does not inform us. But it does inform us that even these earliest of mankind sacrificed to God, as appeared also in the case of the two first brothers; Noah, too, is said to have offered sacrifices to God when he had come forth from the ark after the deluge. And concerning this subject we have already said in the foregoing books that the devils arrogate to themselves divinity, and require sacrifice that they may be esteemed gods, and delight in these honours on no other account than this, because they know that true sacrifice is due to the true God. 17. _Of the two fathers and leaders who sprang from one progenitor._ Since, then, Adam was the father of both lines,--the father, that is to say, both of the line which belonged to the earthly, and of that which belonged to the heavenly city,--when Abel was slain, and by his death exhibited a marvellous mystery, there were henceforth two lines proceeding from two fathers, Cain and Seth, and in those sons of theirs, whom it behoved to register, the tokens of these two cities began to appear more distinctly. For Cain begat Enoch, in whose name he built a city, an earthly one, which was not from home in this world, but rested satisfied with its temporal peace and happiness. Cain, too, means "possession;" wherefore at his birth either his father or mother said, "I have gotten a man through God." Then Enoch means "dedication;" for the earthly city is dedicated in this world in which it is built, for in this world it finds the end towards which it aims and aspires. Further, Seth signifies "resurrection," and Enos his son signifies "man," not as Adam, which also signifies man but is used in Hebrew indifferently for man and woman, as it is written, "Male and female created He them, and blessed them, and called their name Adam,"[184] leaving no room to doubt that though the woman was distinctively called Eve, yet the name Adam, meaning man, was common to both. But Enos means man in so restricted a sense, that Hebrew linguists tell us it cannot be applied to woman: it is the equivalent of the "child of the resurrection," when they neither marry nor are given in marriage.[185] For there shall be no generation in that place to which regeneration shall have brought us. Wherefore I think it not immaterial to observe that in those generations which are propagated from him who is called Seth, although daughters as well as sons are said to have been begotten,