Plato, Meno 87e

ἀρετῇ γʼ ἐσμὲν ἀγαθοί; ναί. εἰ δὲ ἀγαθοί, ὠφέλιμοι· πάντα γὰρ τἀγαθὰ ὠφέλιμα. οὐχί; ναί. καὶ ἡ ἀρετὴ δὴ ὠφέλιμόν ἐστιν; ἀνάγκη ἐκ τῶν ὡμολογημένων. σκεψώμεθα δὴ καθʼ ἕκαστον ἀναλαμβάνοντες ποῖά ἐστιν ἃ ἡμᾶς ὠφελεῖ. ὑγίεια, φαμέν, καὶ ἰσχὺς καὶ κάλλος καὶ πλοῦτος δή· ταῦτα λέγομεν καὶ τὰ τοιαῦτα ὠφέλιμα. οὐχί; ναί.

And if good, profitable; for all good things are profitable, are they not? Yes. So virtue is profitable? That must follow from what has been admitted. Then let us see, in particular instances, what sort of things they are that profit us. Health, let us say, and strength, and beauty, and wealth—these and their like we call profitable, do we not? Yes.