Two important works by one of philosophy's most original and penetrating thinkers appear in this volume. Spinoza's "Theologico-Political Treatise" presents an eloquent plea for religious liberty, demonstrating that true religion consists of the practice of simple piety, independent of philosophical speculation. He examines the Bible at length to show that freedom of thought and of speech are consistent with the religious life. In the unfinished "Political Treatise," the author develops a theory of government founded on common consent.