"Dialogue starts with the willingness to challenge our own thinking, to recognize that any certainty we have is, at best, a hypothesis about the world."

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The growth of our knowledge is the result of a process closely resembling what Darwin called 'natural selection'; that is, the natural selection of hypotheses: our knowledge consists, at every moment, of those hypotheses which have shown their (comparative) fitness by surviving so far in their struggle for existence, a competitive struggle which eliminates those hypotheses which are unfit.

— Karl Popper