...ill learn another; or further, that a man will make proficiency in that which he does not learn. But the many are deceived by this which deceived also the rhetorician Theopompus, when he blames even Plato for wishing everything to be defined. For what does he say? Did none of us before you use the words Good or Just, or do we utter the sounds in an unmeaning and empty way without understanding what th...