Quotes from Karl R. Popper

You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.

When the Marxists say, as they sometimes do, that Marx has proved the uselessness of a counter cycle policy and of similar piecemeal measures, then they simply do not speak the truth; Marx investigated an unrestrained capitalism, and he never dreamt of interventionism.

The theory I have in mind is one which does not proceed, as it were, from a doctrine of the intrinsic goodness or righteousness of a majority rule, but rather from the baseness of tyranny; or more precisely, it rests upon the decision, or upon the adoption of the proposal, to avoid and to resist tyranny.

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.

While differing widely in the various little bits we know, in our infinite ignorance we are all equal.