Plato, Epinomis 977c

ὅτι καὶ μάλʼ ὀρθῶς ἐνοήσαμεν ὡς, εἴπερ ἀριθμὸν ἐκ τῆς ἀνθρωπίνης φύσεως ἐξέλοιμεν, οὐκ ἄν ποτέ τι φρόνιμοι γενοίμεθα. οὐ γὰρ ἂν ἔτι ποτὲ ψυχὴ τούτου τοῦ ζῴου πᾶσαν ἀρετὴν λάβοι σχεδόν, ὅτου λόγος ἀπείη· ζῷον δὲ ὅτι μὴ γιγνώσκοι δύο καὶ τρία μηδὲ περιττὸν μηδὲ ἄρτιον, ἀγνοοῖ δὲ τὸ παράπαν ἀριθμόν, οὐκ ἄν ποτε διδόναι λόγον ἔχοι περὶ ὧν αἰσθήσεις καὶ μνήμας μόνον εἴη κεκτημένον, τὴν

and recall how entirely right we were in conceiving that if we should deprive human nature of number we should never attain to any understanding. For then the soul of that creature which could not tell things would never any more be able, one may say, to attain virtue in general; and the creature that did not know two and three, or odd or even, and was completely ignorant of number, could never clearly tell of things about which it had only acquired sensations and memories. From the attainment of ordinary virtue—