Plato, Meno 88d

ἢ ἀφροσύνης βλαβερά τε καὶ ὠφέλιμα γίγνεται. κατὰ δὴ τοῦτον τὸν λόγον ὠφέλιμόν γε οὖσαν τὴν ἀρετὴν φρόνησιν δεῖ τινʼ εἶναι. ἔμοιγε δοκεῖ. καὶ μὲν δὴ καὶ τἆλλα ἃ νυνδὴ ἐλέγομεν, πλοῦτόν τε καὶ τὰ τοιαῦτα, τοτὲ μὲν ἀγαθὰ τοτὲ δὲ βλαβερὰ εἶναι, ἆρα οὐχ ὥσπερ τῇ ἄλλῃ ψυχῇ ἡ φρόνησις ἡγουμένη ὠφέλιμα τὰ τῆς ψυχῆς ἐποίει, ἡ δὲ ἀφροσύνη βλαβερά, οὕτως αὖ

by the addition of wisdom or folly; and hence, by this argument, virtue being profitable must be a sort of wisdom. I agree. Then as to the other things, wealth and the like, that we mentioned just now as being sometimes good and sometimes harmful—are not these also made profitable or harmful by the soul according as she uses and guides them rightly or wrongly: