By the way, one of the themes lately touched upon in the comments section of this blog is the perennial question of the purpose, function, or justification of Philosophy. It is, I think, rather odd that this question has never exercised me in the slightest. Having identified myself as a philosopher before I was old enough to drive, I somewhat illogically concluded that anything I was interested in was philosophy, including Game Theory, Freudian theories of personality, the economics of Marx, and nuclear deterrence theory.
If I were pressed to say what it is that I imagine myself to be doing as a Professor of Philosophy, I would reply that I grapple with deep, powerful, beautiful ideas and turn them over in my mind until they are transparently clear to me, at which point I show them to others, either in a lecture or in print, so that they too can see how beautiful they are. That is what I was doing in my first book on Kant's First Critique, in my two books on Marx, in my early essay on Hume's Treatise, and in many other writings as well. Is this, as Callicles pointedly asks in the Gorgias, an appropriate way for a mature adult to spend his or her time? I leave it to others to answer. However, I can report, after a long life devoted to such activity, that I have found it deeply satisfying, and not obviously harmful to others.