"Marxism is only an episode—one of the many mistakes we have made in the perennial and dangerous struggle for building a better and freer world."
- Karl Popper
"The aim of argument, or of discussion, should not be victory but progress."
- Karl Popper
"No book can ever be finished. While working on it we learn just enough to find it immature the moment we turn away from it."
- Karl Popper
"What we need and what we want is to moralize politics, not to politicize morals."
- Karl Popper
"Science may be described as the art of systematic oversimplification."
- Karl Popper
"No rational argument will have a rational effect on a man who does not want to adopt a rational attitude."
- Karl Popper
"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."
- Karl Popper
"True ignorance is not the absence of knowledge, but the refusal to acquire it."
- Karl Popper
"All life is problem solving."
- Karl Popper
"Those who promise us paradise on earth never produced anything but a hell."
- Karl Popper
"Our knowledge can only be finite, while our ignorance must necessarily be infinite."
- Karl Popper
"While differing widely in the various little bits we know, in our infinite ignorance we are all equal."
- Karl Popper
"The wise man belongs to all countries, for the home of a great soul is the whole world."
- Karl Popper
"If our civilization is to survive, we must break with the habit of deference to great men."
- Karl Popper
"If you can't say it simply and clearly, keep quiet, and keep working on it till you can."
- Karl Popper
"Denying realism amounts to megalomania."
- Karl Popper
"I hold that he who teaches that not reason but love should rule opens up the way for those who rule by hate."
- Karl Popper
"The future depends on ourselves, and we do not depend on any historical necessity."
- Karl Popper
"The most we can say of democracy or freedom is that they give our personal abilities a little more influence on our well-being."
- Karl Popper
"The way of science is paved with discarded theories which were once declared self-evident."
- Karl Popper
"The smarter you are and the harder you work, the greater the chance you’ll be outperformed by someone dumber and lazier."