The Soul of Humanity is a general appeal to abandon blind faith and apply rational thinking to all important matters of life, from science and relationships to politics and religion. The authors apply the ages-old knowledge of the world's great religions to explain how and why rationality can help civilization climb out of the abyss of superstition and prejudice and unleash humanity's innate powers of reason. The book presents a compelling argument that without rational thinking, the collective "soul of humanity" will remain frozen in a cycle of disunity and social upheaval that defies all efforts to find the holy grail of universal peace, then offers a set of principles and values that can undeniably illuminate the path forward.