“Human history is a fragment of biology. Man is one of countless millions of species and, like all the rest, is subject to the struggle for existence and the competition of the fittest to survive. All psychology, philosophy, statesmanship, and utopias must make their peace with these biological laws. Man can be traced to about a million years before Christ. Agriculture can be traced no farther back than to 25,000 B.C. Man has lived forty times longer as a hunter than as a tiller of the soil in a settled life. In those 975,000 years his basic nature was formed and remains to challenge civilization every day.”
—Will Durant, “Heroes of History”.