This book is a wide-ranging examination of rationalist thought in philosophy from ancient times to the present day. It is written by a superbly qualified cast of philosophers. This book: critically analyzes the concept of rationalism; focuses principally on the golden age of rationalism in the seventeenth and early eighteenth centuries; and, also covers ancient rationalism, nineteenth-century rationalism, and rationalist themes in recent thought. It is organized chronologically. Various philosophical methods and viewpoints are represented.