Plato, Laws 894c

αὖ τῶν πασῶν κινήσεων. ἔστω γὰρ οὖν. οὐκοῦν τὴν μὲν ἕτερον ἀεὶ κινοῦσαν καὶ μεταβαλλομένην ὑφʼ ἑτέρου θήσομεν ἐνάτην αὖ, τήν τε ἑαυτὴν κινοῦσαν καὶ ἕτερον, ἐναρμόττουσαν πᾶσιν μὲν ποιήμασι, πᾶσιν δὲ παθήμασι, καλουμένην δὲ ὄντως τῶν ὄντων πάντων μεταβολὴν καὶ κίνησιν, ταύτην δὲ δεκάτην σχεδὸν ἐροῦμεν. παντάπασι μὲν οὖν. τῶν δὴ δέκα μάλιστα ἡμῖν κινήσεων τίνʼ ἂν προκρίναιμεν

in the total number of motions. Be it so. Thus we shall reckon as ninth on the list that motion which always moves another object and is moved by another; while that motion which moves both itself and another, and which is harmoniously adapted to all forms of action and passion, and is termed the real change and motion of all that really exists,—it, I presume, we shall call the tenth.