Karl Popper Quotes

“No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.”

“Those who promise us paradise on earth never produced anything but a hell.”

“True ignorance is not the absence of knowledge, but the refusal to acquire it.”

“We are social creatures to the inmost centre of our being. The notion that one can begin anything at all from scratch, free from the past, or unindebted to others, could not conceivably be more wrong.”

“We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.”

“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.”