The history of philosophy is not like the history of the sciences to be studied with the intellect alone. That which is receptive in us and that which impinges upon us from history is the reality of man's being unfolding itself in thought.
In the information age you don't teach philosophy as they did after feudalism. You perform it. If Aristotle were alive today he'd have a talk show.
To teach how to live without certainty and yet without being paralysed by hesitation is perhaps the chief thing that philosophy in our age can do for those who study it.
If you read about Mussolini or Stalin or some of these other great monsters of history they were at it all the time that they were getting up in the morning very early. They were physically very active. They didn't eat lunch.