What makes us moral beings? How do we decide what is good and what is evil? And has it always been that way? Hanno Sauer's sweeping new history of humanity, covering five million years of our universal moral values, comes at a crucial moment of crisis for those values, and helps to explain how they arose—and why we need them.

Modern societies are in crisis: a shared universal morality seems to be a thing of the past. Hanno Sauer explains why this appearance is deceptive: in fact, there are universal values that all people share. If we understand the origin of our morality, we can understand its future too.

Sauer explains how processes of biological, cultural, social, and historical evolution shaped the moral grammar that defines our present. Seven chapters recount the crucial moral upheavals of human history showing how the emergence of humankind five million years ago, the rise of first civilizations 5,000 years ago, and the dynamics of moral progress in the last fifty years are interrelated. This genealogical perspective allows us, on the one hand, to see the contradictions and potential conflicts of our moral identities; on the other, it makes clear that we share fundamental values that apply to all human beings at all times. Sauer's elegant prose brings the history of humanity to vivid new life.