A philosopher is not necessarily a man who lectures on philosophy, be it genuine wisdom or mere academic and scholarly word-spinning. He is a man who knows that life is not only for thought about it, and for insight into its deepest reality, but also for living. He is withal as sensitive as a mystic and feels nuances beyond the ordinary, but he cultivates calmness in the midst of normal activity and remains unflappable.
-- Notebooks Category 20: What Is Philosophy? > Chapter 5: The Philosopher > # 78