Irza Fidah's Key Ideas from The Lessons of History
by Will Durant, Ariel Durant

War is one of the constants of history, and has not diminished with civilization or democracy. We have acknowledged war as at present the ultimate form of competition and natural selection in the human species.

“Polemos pater panton” said Heracleitus; war, or competition, is the father of all things, the potent source of ideas, inventions, institutions, and states. Peace is an unstable equilibrium, which can be preserved only by acknowledged supremacy or equal power.

The causes of war are the same as the causes of competition among individuals: acquisitiveness, pugnacity, and pride; the desire for food, land, materials, fuels, mastery.

Since inequality grows in an expanding economy, a society may find itself divided between a cultured minority and a majority of men and women too unfortunate by nature or circumstance to inherit or develop standards of excellence and taste. As this majority grows it acts as a cultural drag upon the minority; its ways of speech, dress, recreation, feeling, judgment, and thought spread upward, and internal barbarization by the majority is part of the price that the minority pays for its control of educational and economic opportunity.

We must not demand of progress that it should be continuous or universal. Obviously there are retrogressions, just as there are periods of failure, fatigue, and rest in a developing individual; if the present stage is an advance in control of the environment, progress is real.