When I first began to study philosophy, there was not much concern with its political implications. One thought of philosophers as being a few removes from the public forum, concerned with loftier matters, operating far from the untidiness of the social scene in a cool oasis where the imagination could play and consciousness unfold at its own pace. It was a pure world, to be sure, and the purist view is by no means an obsolete one. Just the other day I heard a well-known philosopher in heated argument with a campus activist say that the responsibilities of a professional philosopher end with his profession, that his political obligations qua philosopher were nil.