If there is any ground for the moving to and fro of human souls into different bodies, why may they not return into the very substance they have left, seeing this is to be restored, to be that which had been? They are no longer the very things they had been; for they could not be what they were not, without first ceasing to be what they had been. If we were inclined to give all rein upon this point, discussing into what various beasts one and another might probably be changed, we would need at our leisure to take up many points. But this we would do chiefly in our own defense, as setting forth what is greatly worthier of belief, that a man will come back from a man—any given person from any given person, still retaining his humanity; so that the soul, with its qualities unchanged, may be restored to the same condition, thought not to the same outward framework. Assuredly, as the reason why restoration takes place at all is the appointed judgment, every man must needs come forth the very same who had once existed, that he may receive at God’s hands a judgment, whether of good desert or the opposite. And therefore the body too will appear; for the soul is not capable of suffering without the solid substance (that is, the flesh; and for this reason, also) that it is not right that souls should have all the wrath of God to bear: they did not sin without the body, within which all was done by them. But how, you say, can a substance which has been dissolved be made to reappear again? Consider thyself, O man, and thou wilt believe in it! Reflect on what you were before you came into existence. Nothing. For if you had been anything, you would have remembered it. You, then, who were nothing before you existed, reduced to nothing also when you cease to be, why may you not come into being again out of nothing, at the will of the same Creator whose will created you out of nothing at the first?
Tertullian
Apology
Chapter XLVIII