Popper, Karl

"Art and science are both human responses to the unknown."

"Courage in thinking means being willing to question your most cherished beliefs."

"The universe is not indifferent to us; we impose meaning upon it."

"Institutional checks and balances are more reliable than the virtue of rulers."

"Every theory contains within it the seeds of its own refutation."

"We are born ignorant, not stupid. Education should cultivate critical thinking, not acceptance."

"The pursuit of certainty is the source of much human misery."

"Imagination is more important than accurate knowledge of the way things are."

"Revolutions often bring about the evils they sought to destroy."

"The capacity to think freely is the greatest human freedom."

"We must learn to distinguish between dogmatism and legitimate authority."

"The growth of science depends on our willingness to be proven wrong."

"Love of truth requires the courage to abandon cherished illusions."

"Society progresses not through grand ideologies but through incremental improvements."

"The future is something we create, not something that happens to us."

"Tolerance does not mean tolerating the intolerant."

"We learn more from our failures than from our successes."

"The best predictions come from understanding past errors, not past successes."

"To philosophize is to question; to stop questioning is to stop philosophizing."

"Social engineering can only work when guided by humility about human limitations."

"The open mind is not an empty mind; it is a mind actively seeking truth."

"Authority must always be questioned; authority that cannot be questioned is tyranny."

"We cannot know the future, but we can work to prevent the worst."

"True learning begins where certainty ends."

"The scientific method is simply the formalization of our natural human curiosity."

"Politics without ethics is manipulation; ethics without politics is impotent."

"The measure of civilization is not how much we know, but how we treat the vulnerable."

"Unexamined assumptions are the foundations of human error."

"We are all responsible for the world we create through our choices and actions."

"The pursuit of truth requires intellectual humility and moral courage."