This volume attempts to do justice to a philosopher who has hardly received the consideration he deserves. He is recognized by the more liberal-minded among Italians as the greatest and most daring thinker their country has produced. He has been recognized as the prophet, if not as the actual founder, of modern philosophy, and as one of the earliest apostles of freedom of thought and of speech in modern times. Part I of the book covers the life of Bruno; Part II his philosophy. Sources of the Philosophy; Foundations of Knowledge; Infinite Universe-The Mirror of God; Nature and the Living Worlds; The Last and the Least Things: Atoms and Soul-Monads; Practical Philosophy of Bruno; Higher Life; Positive Religions and the Religion of Philosophy; Bruno in the History of Philosophy.