“There are many difficulties impeding the rapid spread of reasonableness.”
Utopia and Violence (1947)
Context: There are many difficulties impeding the rapid spread of reasonableness. One of the main difficulties is that it always takes two to make a discussion reasonable. Each of the parties must be ready to learn from the other. You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.
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Karl Popper 82
Austrian-British philosopher of science 1902–1994Related quotes

The Essays Or Counsels, Civil And Moral, Of Francis Ld. Verulam Viscount St. Albans (1857), Of Empire

1790s, Discourse to the Theophilanthropists (1798)
Context: The atheist who affects to reason, and the fanatic who rejects reason, plunge themselves alike into inextricable difficulties. The one perverts the sublime and enlightening study of natural philosophy into a deformity of absurdities by not reasoning to the end. The other loses himself in the obscurity of metaphysical theories, and dishonours the Creator, by treating the study of his works with contempt. The one is a half-rational of whom there is some hope, the other a visionary to whom we must be charitable.

As quoted in Nkrumah, Gamal (1–7 November 2001)
Al-Ahram Weekly interview (2001)

The Spirit of Revolt (1880)
Context: One courageous act has sufficed to upset in a few days the entire governmental machinery, to make the colossus tremble; another revolt has stirred a whole province into turmoil, and the army, till now always so imposing, has retreated before a handful of peasants armed with sticks and stones. The people observe that the monster is not so terrible as they thought they begin dimly to perceive that a few energetic efforts will be sufficient to throw it down. Hope is born in their hearts, and let us remember that if exasperation often drives men to revolt, it is always hope, the hope of victory, which makes revolutions.
The government resists; it is savage in its repressions. But, though formerly persecution killed the energy of the oppressed, now, in periods of excitement, it produces the opposite result. It provokes new acts of revolt, individual and collective, it drives the rebels to heroism; and in rapid succession these acts spread, become general, develop. The revolutionary party is strengthened by elements which up to this time were hostile or indifferent to it.

“Divide each difficulty into as many parts as is feasible and necessary to resolve it.”
Source: Discourse on Method

“He who comes from hell, easily find the solution to many difficulties.”
Original: Chi proviene dall'inferno trova facilmente la soluzione a molte difficoltà.
Source: prevale.net

Source: The Geological Evidences of the Antiquity of Man (1863), Ch.20, p. 386