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.
Karl Popper, “Utopia and Violence,” address to Institut des Arts in Brussels, Belgium (1947); later published The Hibbert Journal 46 (1948), and in Conjectures and Refutations: The Growth of Scientific Knowledge (1963).
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Karl Popper
