Plato, Laws 733b

λύπην δὲ οὔθʼ αἱρούμεθα οὔτε βουλόμεθα, τὸ δὲ μηδέτερον ἀντὶ μὲν ἡδονῆς οὐ βουλόμεθα, λύπης δὲ ἀλλάττεσθαι βουλόμεθα· λύπην δʼ ἐλάττω μετὰ μείζονος ἡδονῆς βουλόμεθα, ἡδονὴν δʼ ἐλάττω μετὰ μείζονος λύπης οὐ βουλόμεθα, ἴσα δὲ ἀντὶ ἴσων ἑκάτερα τούτων οὐχ ὡς βουλόμεθα ἔχοιμεν ἂν διασαφεῖν. ταῦτα δὲ πάντα ἐστὶν πλήθει καὶ μεγέθει καὶ σφοδρότησιν ἰσότησίν τε, καὶ ὅσα ἐναντία ἐστὶν πᾶσι τοῖς τοιούτοις πρὸς βούλησιν, διαφέροντά τε καὶ μηδὲν

but pain we neither choose nor desire; and the neutral state we do not desire in place of pleasure, but we do desire it in exchange for pain; and we desire less pain with more pleasure, but we do not desire less pleasure with more pain; and when the two are evenly balanced, we are unable to state any clear preference. Now all these states—in their number, quantity, intensity, equality, and in the opposites thereof—have, or have not, influence on desire,