Plato, Epinomis 988d

νῦν δʼ ὅτε λέγομεν ψυχὴν μέν, ἄνπερ ἐν σώματι γένηται, θαῦμα οὐδὲν κινεῖν τε καὶ περιφέρειν τοῦτο καὶ ἑαυτήν, οὐδʼ ἡμῖν ἀπιστεῖ ψυχὴ κατὰ λόγον οὐδένα ὡς βάρος οὐδὲν περιφέρειν δυναμένη. διὸ καὶ νῦν ἡμῶν ἀξιούντων, ψυχῆς οὔσης αἰτίας τοῦ ὅλου, καὶ πάντων μὲν τῶν ἀγαθῶν ὄντων τοιούτων, τῶν δὲ αὖ φλαύρων τοιούτων ἄλλων, τῆς μὲν φορᾶς πάσης

instead of that which the soul had for moving both the body and itself. But now that we account it no marvel that the soul, once it is in the body, should stir and move about this and itself, neither does our soul on any reckoning mistrust her power of moving about any weight. And therefore, since we now claim that, as the soul is cause of the whole, and all good things are causes of like things, while on the other hand evil things are causes of other things like them, it is no marvel