Popper, Karl

"Criticism is the only known antidote to error."

"The claim to have found the absolute truth is the claim to be God."

"Man can alter his life by altering his thinking."

"You cannot learn to swim without entering the water."

"The future is open. It is not predetermined."

"Freedom and equality are not compatible."

"We are all responsible for our beliefs and their consequences."

"The criterion of the scientific status of a theory is its falsifiability."

"Error is not only permitted, it is indispensable."

"I have always believed that the open society is the best society."

"The more successful the violence on behalf of an ideology, the more mythological that ideology becomes."

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

"The ultimate goal should always be to diminish human suffering."

"We learn from our mistakes, but we rarely learn from our successes."

"Truth is not democratic; it is not determined by majority vote."

"Reason alone cannot answer the deeper questions of life."

"Every organism tends toward survival and adaptation."

"The growth of our knowledge is entirely in the realm of the possible."

"There is nothing to fear but fear itself, and irrationality."

"We must be prepared to admit that our best efforts may be wrong."

"Life is not about having all the answers, but asking better questions."

"The search for truth is nobler than the possession of it."

"Every man is responsible for his own thoughts and actions."

"Science is not a body of laws; it is a method of inquiry."

"We are shaped by the problems we choose to solve."

"Utopian thinking often leads to dystopian results."

"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

"You cannot build a good society on the basis of lies."

"Change is the only constant in the universe."

"The essence of democracy is the freedom to criticize."