You'll gain such an understanding from this helpful guide by one of America's leading philosophers, Ralph M. McInerny of Notre Dame. Writing with humor and verve, McInerny in just seventy-five pages takes you on an enlightening tour of two and a half millennia of philosophy. From Aristotle and Aquinas to Descartes, Kant, and Nietzsche, you'll learn about the most important thinkers and schools of thought.