Plato, Meno 88a

ταὐτὰ δὲ ταῦτά φαμεν ἐνίοτε καὶ βλάπτειν· ἢ σὺ ἄλλως φῂς ἢ οὕτως; οὐκ, ἀλλʼ οὕτως. σκόπει δή, ὅταν τί ἑκάστου τούτων ἡγῆται, ὠφελεῖ ἡμᾶς, καὶ ὅταν τί, βλάπτει; ἆρʼ οὐχ ὅταν μὲν ὀρθὴ χρῆσις, ὠφελεῖ, ὅταν δὲ μή, βλάπτει; πάνυ γε. ἔτι τοίνυν καὶ τὰ κατὰ τὴν ψυχὴν σκεψώμεθα. σωφροσύνην τι καλεῖς καὶ δικαιοσύνην καὶ ἀνδρείαν καὶ εὐμαθίαν καὶ μνήμην καὶ μεγαλοπρέπειαν καὶ πάντα τὰ

But these same things, we admit, actually harm us at times; or do you dispute that statement? No, I agree. Consider now, what is the guiding condition in each case that makes them at one time profitable, and at another harmful. Are they not profitable when the use of them is right, and harmful when it is not? To be sure. Then let us consider next the goods of the soul: by these you understand temperance, justice, courage, intelligence, memory, magnanimity, and so forth?