"A people contending for life and liberty are seldom disposed to look with a favorable eye upon either men or measures whose passions, interests or consequences will clash with those inestimable objects."

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But some of these theories are so bold that they can clash with reality: they are the testable theories of science. And when they clash, then we know that there is a reality; something that can inform us that our ideas are mistaken.

— Karl Popper