Plato, Meno 86a

δῆλον, ὅτι ἐν ἄλλῳ τινὶ χρόνῳ εἶχε καὶ ἐμεμαθήκει; φαίνεται. οὐκοῦν οὗτός γέ ἐστιν ὁ χρόνος ὅτʼ οὐκ ἦν ἄνθρωπος; ναί. εἰ οὖν ὅν τʼ ἂν ᾖ χρόνον καὶ ὃν ἂν μὴ ᾖ ἄνθρωπος, ἐνέσονται αὐτῷ ἀληθεῖς δόξαι, αἳ ἐρωτήσει ἐπεγερθεῖσαι ἐπιστῆμαι γίγνονται, ἆρʼ οὖν τὸν ἀεὶ χρόνον μεμαθηκυῖα ἔσται ἡ ψυχὴ αὐτοῦ; δῆλον γὰρ ὅτι τὸν πάντα χρόνον ἔστιν ἢ οὐκ ἔστιν ἄνθρωπος. φαίνεται.

that he had them and learnt them during some other time? Apparently. And this must have been the time when he was not a human being? Yes. So if in both of these periods—when he was and was not a human being—he has had true opinions in him which have only to be awakened by questioning to become knowledge, his soul must have had this cognizance throughout all time? For clearly he has always either been or not been a human being. Evidently. And if the truth of all things that are is always