Popper, Karl

"The future is always open; it has not yet been determined."

"Our duty is not to settle the question, but to keep it open and alive."

"I prefer Socratic dialogue to pontificating; the former leaves room for genuine encounter."

"Man can certainly strive toward his goals, but he cannot always achieve them."

"The attempt to replace imagination by facts, by observation, is absurd."

"There exists an almost complete absence of even the most elementary knowledge."

"We are trapped in a state of nature from which we can escape only through science and reason."

"Language is of paramount importance in all human endeavors."

"Change is not only inevitable but necessary for progress."

"One should as a rule respect public opinion in so far as is necessary to avoid starvation."

"Misery and suffering have always been with us, but so has the human will to overcome them."

"The simplest solution is often the best, yet the truth is rarely simple."

"We must be prepared to question everything we believe."

"Time is not a property of the world; it is a property of our perspective on the world."

"Art expresses what cannot be put into words."

"Every action we take is, in a sense, a wager about the future."

"The more we learn, the more we realize how much we do not know."

"History shows that our mistakes are often more instructive than our successes."

"We should never cease to criticize, to question, and to wonder."

"Violence is the first resort of the inarticulate."

"Freedom is not a given; it must be continually fought for and defended."

"The struggle for knowledge is endless; completion is not possible."

"What we call progress is not inevitable; we must choose it consciously."

"Every theory has its blind spots."

"We must learn to live with uncertainty and still take action."

"Imagination is more important than knowledge, but it is also more dangerous."

"The most important thing is not the answer, but the quality of the question."

"We are the only animals that can engage in deliberate self-destruction through ideology."

"Truth is hard; falsity is easy and comfortable."

"Our actions are the only things we can truly control in this world."