Popper, Karl

"The future belongs to those who believe in the beauty of their dreams."

"Success is not final, failure is not fatal."

"Life's greatest adventure is the journey of self-discovery."

"The growth of knowledge consists in the main of the discovery and exposure of previous errors and misconceptions."

"We are not students of some subject matter, but students of problems. And problems may cut across the borders of any subject matter or discipline."

"Science may be described as the art of systematic over-simplification."

"The attempt to make heaven on earth produces hell."

"Our knowledge is a little island in a great ocean of nonknowledge."

"All life is problem solving."

"The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know."

"Criticism of my own work has always been my most valuable teacher."

"To be a citizen of the world today means to be aware that the world we know is always incomplete and imperfect."

"In politics, the unknown remains unknown and therefore cannot guide us. We must act in ignorance."

"The true spirit of science is not certainty but uncertainty, not dogma but inquiry."

"Every solution to a problem creates new problems."

"We should be looking for how we are wrong, not how we are right."

"The so-called philosophy of common sense is the least philosophical of all approaches."

"Totalitarianism thrives on the lies of ideological certainty."

"There is no knowledge without problems; no problems without knowledge."

"The future is not predetermined; we have the power to create it through our choices."

"Scientific theories are not conclusions proven by evidence; they are conjectures that survive refutation attempts."

"We must distinguish between the logic of discovery and the logic of justification."

"The open society is based on the idea that no one has absolute truth."

"Piecemeal social engineering is superior to utopian planning because it allows for correction."

"Our task is not to possess the truth but to search for it relentlessly."

"The problems of the world cannot be solved by skeptics or by dogmatists, but only by critical thinkers."

"History does not have laws; it has patterns that we interpret through our theories."

"The worst kind of ignorance is the ignorance of our own ignorance."

"We learn through trial and error, through making mistakes and correcting them."

"Democracy is not the rule of the people; it is the absence of the rule of a dictator."