Tertullian — A Treatise on the Soul 30
But what must we say in reply to what follows? For, in the first place, if the living come from the dead, just as the dead proceed from the living, then there must always remain unchanged one and the selfsame number of mankind , even the number which originally introduced ( human ) life. The living preceded the dead, afterwards the dead issued from the living, and then again the living from the dead. Now, since this process was evermore going on with the same persons , therefore they, issuing from the same, must always have remained in number the same. For they who emerged (into life) could never have become more nor fewer than they who disappeared (in death).
We find, however, in the records of the Antiquities of Man, that the human race has progressed with a gradual growth of population, either occupying different portions of the earth as aborigines, or as nomad tribes, or as exiles, or as conquerors — as the Scythians in Parthia, the Temenidæ in Peloponnesus, the Athenians in Asia, the Phrygians in Italy , and the Phœnicians in Africa; or by the more ordinary methods of migration, which they call ἀποικίαι or colonies , for the purpose of throwing off redundant population, disgorging into other abodes their overcrowded masses. The aborigines remain still in their old settlements, and have also enriched other districts with loans of even larger populations.
Surely it is obvious enough, if one looks at the whole world, that it is becoming daily better cultivated and more fully peopled than anciently. All places are now accessible, all are well known, all open to commerce; most pleasant farms have obliterated all traces of what were once dreary and dangerous wastes; cultivated fields have subdued forests; flocks and herds have expelled wild beasts; sandy deserts are sown; rocks are planted; marshes are drained; and where once were hardly solitary cottages, there are now large cities. No longer are (savage) islands dreaded, nor their rocky shores feared; everywhere are houses, and inhabitants, and settled government, and civilized life.
What most frequently meets our view (and occasions complaint), is our teeming population: our numbers are burdensome to the world , which can hardly supply us from its natural elements; our wants grow more and more keen, and our complaints more bitter in all mouths, while Nature fails in affording us her usual sustenance. In very deed, pestilence, and famine, and wars , and earthquakes have to be regarded as a remedy for nations, as the means of pruning the luxuriance of the human race ; and yet, when the hatchet has once felled large masses of men , the world has hitherto never once been alarmed at the sight of a restitution of its dead coming back to life after their millennial exile.