Plato, Laws 896b

ἀνεφάνη μεταβολῆς τε καὶ κινήσεως ἁπάσης αἰτία ἅπασιν; οὔκ, ἀλλὰ ἱκανώτατα δέδεικται ψυχὴ τῶν πάντων πρεσβυτάτη, γενομένη γε ἀρχὴ κινήσεως. ἆρʼ οὖν οὐχ ἡ διʼ ἕτερον ἐν ἄλλῳ γιγνομένη κίνησις, αὐτὸ δὲ ἐν αὑτῷ μηδέποτε παρέχουσα κινεῖσθαι μηδέν, δευτέρα τε, καὶ ὁπόσων ἀριθμῶν βούλοιτο ἄν τις ἀριθμεῖν αὐτὴν πολλοστήν, τοσούτων, σώματος οὖσα ὄντως ἀψύχου μεταβολή; ὀρθῶς. ὀρθῶς ἄρα καὶ κυρίως ἀληθέστατά τε καὶ τελεώτατα

that is opposite to these, seeing that it has been plainly shown to be the cause of all change and motion in all things? We make no such complaint; on the contrary, it has been proved most sufficiently that soul is of all things the oldest, since it is the first principle of motion. Then is not that motion which, when it arises in one object, is caused by another, and which never supplies self-motion to anything, second in order—or indeed as far down the list as one cares to put it,—it being the change of a really soulless body? True. Truly and finally, then, it would be a most veracious and complete statement