Book excerpt: In this work, Baruch Spinoza, one of the cardinal thinkers of all times, answers the eternal questions of man and his passions, and God and nature. In the deepest sense, this dictionary of Spinoza’s philosophy is a veritable treasury of sublime wisdom. In his introduction, Dagobert D. Runes, a life-long student of the philosopher, sheds new light on Spinoza’s private, political and religious life, and exposes and explains the dramatic story of his apostasy. If the reader despairs of the business of finding his way through Spinoza’s works, here he will find a reliable guide speaking in Spinoza’s own words. “The grand ideas of Spinoza’s Ethics are brought out clearly in this book: not less than the heroic illusions of this great and passionate man.” —Albert Einstein