But in its confidence and sweep, the vast timescale, its humane standpoint and its confident world-view, it is something more than a science book: it is an epic history by an optimist who can list his reasons to be cheerful and support them with persuasive instances.

I don't know if he's right, but I do think this book is a winner.

The biggest problem with the book, though, is its overreliance on history, which, like the light on a caboose, shows us only where we are not going.

“The Better Angels of Our Nature” is a supremely important book. To have command of so much research, spread across so many different fields, is a masterly achievement. Pinker convincingly demonstrates that there has been a dramatic decline in violence, and he is persuasive about the causes of that decline.

While Pinker makes a great show of relying on evidence—the 700-odd pages of this bulky treatise are stuffed with impressive-looking graphs and statistics—his argument that violence is on the way out does not, in the end, rest on scientific investigation. He cites numerous reasons for the change, including increasing wealth and the spread of democracy. For him, none is as important as the adoption of a particular view of the world: “The reason so many violent institutions succumbed within so short a span of time was that the arguments that slew them belong to a coherent philosophy that emerged during the Age of Reason and the Enlightenment. The ideas of thinkers like Hobbes, Spinoza, Descartes, Locke, David Hume, Mary Astell, Kant, Beccaria, Smith, Mary Wollstonecraft, Madison, Jefferson, Hamilton and John Stuart Mill coalesced into a worldview that we can call Enlightenment humanism.”