In this work Baruch Spinoza, one of the cardinal thinkers of all time, answers the eternal questions of man and his passions, God and nature. In the deepest sense, this dictionary of Spinoza's philosophy is a veritable treasury of sublime wisdom.

Dagobah David Runes (January 6, 1902 – September 24, 1982) was a philosopher and author. He is associated with The Philosophical Library, a spiritual organization and publisher. Runes was a colleague and friend of Albert Einstein.

Runes is responsible for publishing an English translation of Marx's On the Jewish Question, which he published under the title A World without Jews, and editing The Dictionary of Philosophy, published in 1942.