“External pressure seems to produce internal unity.”

— Kenneth N. Waltz , book Man, the State, and War

Source: Man, the State, and War (1959), Chapter V, Some Implications Of The Second Image, p. 149

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Kenneth N. Waltz 26

American political scientist and international relations th… 1924–2013

Peter Farb (1929–1980) American academic and writer

Man's Rise to Civilization (1968)
Context: For a tribe to endure, it must find some way to achieve internal unity—and that way usually is external strife. The tribe exists at all times in a state of mobilization for war against its neighbors. The slightest incident, or often merely a desire to increase prestige, is enough to set off a skirmish, and in such circumstances hatred against external enemies must be unremitting.<!-- p. 97

“A positive pressure produces an attractive gravitational field… Positive pressures are just sort of normal pressures and attractive gravity is normal gravity, so normal pressures produce normal gravity, but it is possible to have negative pressures, and negative pressures produce repulsive gravity, and that's the secret of what makes inflation possible.”

Alan Guth (1947) American theoretical physicist and cosmologist

Lecture 1: Inflationary Cosmology: Is Our Universe Part of a Multiverse? Part I.
The Early Universe (2012)

“Acting is all internal, but must be externalized.”

Sarah Bernhardt (1844–1923) French actress

“A sensation is the feeling of an external stimulus or an internal condition.”

Will Durant (1885–1981) American historian, philosopher and writer

Source: Fallen Leaves (2014), Ch. 6 : Our Souls

“External nature is only internal nature writ large.”

Swami Vivekananda (1863–1902) Indian Hindu monk and phylosopher

Pearls of Wisdom

“I am for the unity of the party – for the national and international unity of the party. But it must be a unity of socialism and socialists. The unity with opponents – with people who have other aims and other interests, is no socialist unity.”

Wilhelm Liebknecht (1826–1900) German socialist politician

We must strive for unity at any price and with all sacrifices. But while we are uniting and organizing, we must rid ourselves of all foreign and antagonistic elements. What would one say of a general who in the enemy’s country sought to fill the ranks of his army with recruits from the ranks of the enemy? Would that not be the height of foolishness? Very well, to take into our army – which is an army for the class struggle and the class war – opponents, soldiers with aims and interests entirely opposite to our own, – that would be madness, that would be suicide.
No Compromise – No Political Trading (1899)