This book is not addressed to beginning students in philosophy so much as it is addressed to those who, though fairly well-versed in the philosophical tradition, find themselves frankly baffled and brought up short by the writ ings of Martin Heidegger, and who-while recognizing the novelty of the Heideggerean enterprise - may sometimes find themselves wondering if this "thinking of Being" is after all rich enough to deserve still further effort on their part. That at least was my own state of mind after a couple of years spent in studying Heidegger. Then one day, in preparing for a seminar, I...