This is not a well-travelled path for most scholars, or one that minds are eager to wander. None of us has ever attempted it, and no one Greek has covered all of it. Most people look for attractive fields of research; those which are treated by others are said to be of immense subtlety, and are weighed down by the gloomy obscurity of the subject. Now all the subjects that the Greeks call enkuklios paideia ought to be dealt with but they are unknown or made confusing by over-complications, while others are so often discussed that they become tedious. It is a difficult thing to give novelty to the familiar, authority to the brand new, shine to the out-of-date, clarity to the obscure, charm to the dull, authority to the implausible, its nature to everything and all its own to nature. And this is why even if I have not succeeded, it is a brilliant and beautiful enterprise.