The mind’s amazing ability of cogitation is encapsulated in the works of our great philosophers. Their ideas, such as “I think, therefore I am,” have become lasting certitudes, which have influenced important areas of life including art, education, politics, and government. Leading philosophers conduct a rational investigation of Truth to arrive at a set of principles that others believe and adopt. This compendium of the world’s greatest thinkers includes the likes of Confucius, Aristotle, Immanuel Kant, Hannah Arendt, and René Descartes.