플라톤의 대화편 파이돈 - 죽음 후 영혼의 삶: 기억, 2부 중 2부

“Then there is a new way in which we arrive at the inference that the living come from the dead, just as the dead come from the living; and if this is true, then the souls of the dead must be in some place out of which they come again. And this, as I think, has been satisfactorily proved.” “Yes, Socrates,” he said, “all this seems to flow necessarily out of our previous admissions.” “And that these admissions are not unfair, Cebes,” He said, “may be shown, as I think, in this way: If generation were in a straight line only, and there were no compensation or circle in nature, no turn or return into one another, then you know that all things would at last have the same form and pass into the same state, and there would be no more generation of them.”