Plato, Laws 895b

τὴν αὐτὴν ἑαυτὴν δήπου κινοῦσαν· ὑπʼ ἄλλου γὰρ οὐ μήποτε ἔμπροσθεν μεταπέσῃ, μηδεμιᾶς γε ἐν αὐτοῖς οὔσης ἔμπροσθεν μεταπτώσεως. ἀρχὴν ἄρα κινήσεων πασῶν καὶ πρώτην ἔν τε ἑστῶσιν γενομένην καὶ ἐν κινουμένοις οὖσαν τὴν αὑτὴν κινοῦσαν φήσομεν ἀναγκαίως εἶναι πρεσβυτάτην καὶ κρατίστην μεταβολὴν πασῶν, τὴν δὲ ἀλλοιουμένην ὑφʼ ἑτέρου, κινοῦσαν δὲ ἕτερα δευτέραν. ἀληθέστατα λέγεις.

since no shifting force exists in things beforehand. Therefore we shall assert that inasmuch as the self-moving motion is the starting-point of all motions and the first to arise in things at rest and to exist in things in motion, it is of necessity the most ancient and potent change of all, while the motion which is altered by another thing and itself moves others comes second. Most true. Now that we have come to this point in our discourse,