The 50 most influential philosophers to shape our world. From the classical thinkers to modern economic theories, and from the groundbreaking advances in psychology to the cutting-edge of postmodernist theory, the Little Book of Big Ideas: Philosophy discusses those thinkers, thoughts and ideas that have advanced knowledge, society, and human life, and why they are important. Whether on the rights of man or the rights of woman, the origin of the species or the origins of morality, the existence of the Ego or the existence of God, here are the greatest ideas from the greatest thinkers that humankind has ever known.