Aristotle, Eudemian Ethics, Book 2 49:

διωρισμένων δὲ τούτων, ληπτέον ὅτι ἐν ἅπαντι συνεχεῖ καὶ διαιρετῷ ἐστιν ὑπεροχὴ καὶ ἔλλειψις καὶ μέσον, καὶ ταῦτα ἢ πρὸς ἄλληλα ἢ πρὸς ἡμᾶς, οἱο῀ν ἐν γυμναστικῇ, ἐν ἰατρικῇ, ἐν οἰκοδομικῇ, ἐν κυβερνητικῇ, καὶ ἐν ὁποιᾳοῦν πράξει, καὶ ἐπιστημονικῇ καὶ ἀνεπιστημονικῇ, καὶ τεχνικῇ καὶ ἀτέχνῳ.? ἡ μὲν γὰρ κίνησις συνεχές, ἡ δὲ πρᾶξις κίνησις.?