“What goes too long unchanged destroys itself.”

Source: Odd Thomas

Martin Pippin in the Apple Orchard (1922)

Le désespoir lui-même, pour peu qu'il se prolonge, devient une sorte d'asile dans lequel on peut s'asseoir et reposer.

"Vie de Joseph Delorme" (1829), cited from Poésies completes de Sainte-Beuve (Paris: Charpentier, 1840) p. 16; Mardy Grothe Oxymoronica (London: HarperCollins, 2004) p. 201.

Source: The Worldly Philosophers (1953), Chapter VII, The Underworld of Economics, p. 188
Context: The book was called Imperialism; it was a devastating volume. For here was the most important and searing criticism which had ever been levied against the profit system. The worst that Marx had claimed was that the system would destroy itself; what Hobson suggested was that it might destroy the world. He saw the process of imperialism as a relentless and restless tendency of capitalism to rescue itself from a self-imposed dilemma, a tendency that necessarily involved foreign commercial conquest and that thereby inescapably involved a constant risk of war. No more profound moral indictment of capitalism had ever been posed.

Letter to all State Governors on a Uniform Soil Conservation Law (26 February 1937) http://www.presidency.ucsb.edu/ws/?pid=15373); this statement has sometimes been paraphrased and prefixed to an earlier FDR statement of 29 January 1935 to read: "A nation that destroys its soils destroys itself. Forests are the lungs of our land, purifying the air and giving fresh strength to our people." Though it approximates 2 separate statements of FDR, no original document in precisely this form has been located.
1930s

Source: The Broken God (1992), p. 236

XVII. That the World is by nature Eternal.
On the Gods and the Cosmos
Context: Everything that is destroyed is either destroyed by itself or by something else. If the world is destroyed by itself, fire must needs burn of itself and water dry itself. If by something else, it must be either by a body or by something incorporeal. By something incorporeal is impossible; for incorporeal things preserve bodies — nature, for instance, and soul — and nothing is destroyed by a cause whose nature is to preserve it. If it is destroyed by some body, it must be either by those which exist or by others. … But if the world is to be destroyed by other bodies than these it is impossible to say where such bodies are or whence they are to arise.

Vorkosigan Saga, Brothers in Arms (1989)

Source: 1984