Aristotle, Nicomachean Ethics, Book 10 21:

δίκαιοι γάρ εἰσι μᾶλλον καὶ ἀνδρεῖοι, ἔστι δὲ καὶ δικαιοπραγεῖν καὶ σωφρονεῖν μᾶλλον καὶ ἧττον. εἰ δὲ ταῖσ ἡδοναῖσ, μή ποτ’ οὐ λέγουσι τὸ αἴτιον, ἂν ὦσιν αἳ μὲν ἀμιγεῖσ αἳ δὲ μικταί. καὶ τί κωλύει, καθάπερ ὑγίεια ὡρισμένη οὖσα δέχεται τὸ μᾶλλον καὶ τὸ ἧττον, οὕτω καὶ τὴν ἡδονήν;