Isocrates, Panegyric of Athens 9

αἱ μὲν γὰρ πράξεις αἱ προγεγενημέναι κοιναὶ πᾶσιν ἡμῖν κατελείφθησαν, τὸ δ’ ἐν καιρῷ ταύταις καταχρήσασθαι καὶ τὰ προσήκοντα περὶ ἑκάστης ἐνθυμηθῆναι καὶ τοῖς ὀνόμασιν εὖ διαθέσθαι τῶν εὖ φρονούντων ἴδιόν ἐστιν.

The deeds which were done in the past have been bequeathed to us all in common, but the full use of them at the right moment, the consideration of the correct opinions about each one, and the good arrangement of them in words, are a particular ability of men of good counsel.