The minds 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 worlds greatest thinkers includes the likes of Confucius, Aristotle, Immanuel Kant, Hannah Arendt, and Ren Descartes.