Let us, then, omit the conjectures of men who know not what they say, when they speak of the nature and origin of the human race. For some hold the same opinion regarding men that they hold regarding the world itself, that they have always been. Thus Apuleius says when he is describing our race, "Individually they are mortal, but collectively, and as a race, they are immortal." And when they are asked, how, if the human race has always been, they vindicate the truth of their history, which narrates who were the inventors, and what they invented, and who first instituted the liberal studies and the other arts, and who first inhabited this or that region, and this or that island? they reply that most, if not all lands, were so desolated at intervals by fire and flood, that men were greatly reduced in numbers, and from these, again, the population was restored to its former numbers, and that thus there was at intervals a new beginning made, and though those things which had been interrupted and checked by the severe devastations were only renewed, yet they seemed to be originated then, but that man could not exist at all save as produced by man. But they say what they think, not what they know.