Karl Popper
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"Sir Karl Raimund Popper" was an Austrian-British philosopher and professor. He is generally regarded as one of the greatest philosophy of science/philosophers of science of the 20th century.

Popper is known for his rejection of the classical Inductivism/inductivist views on the scientific method, in favour of Falsifiability/empirical falsification: A theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can and should be scrutinised by decisive experiments. If the outcome of an experiment contradicts the theory, one should refrain from ad hoc manoeuvres that evade the contradiction merely by making it less falsifiable. Popper is also known for his opposition to the classical justificationism/justificationist account of knowledge which he replaced with critical rationalism, "the first non-justificational philosophy of criticism in the history of philosophy."

In political discourse, he is known for his vigorous defence of liberal democracy and the principles of social criticism that he came to believe made a flourishing "open society" possible. His political philosophy embraces ideas from all major democratic political ideologies and attempts to reconcile them: social democracy, classical liberalism and conservatism, more explicitly so in his later years.

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Those who promise us paradise on earth never produced anything but a hell.

We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.

Philosophers should consider the fact that the greatest happiness principle can easily be made an excuse for a benevolent dictatorship. We should replace it by a more modest and more realistic principle / the principle that the fight against avoidable misery should be a recognized aim of public policy, while the increase of happiness should be left, in the main, to private initiative.

We all remember how many religious wars were fought for a religion of love and gentleness; how many bodies were burned alive with the genuinely kind intention of saving souls from the eternal fire of hell.

Science must begin with myths, and with the criticism of myths.

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

It is impossible to speak in such a way that you cannot be misunderstood.

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

Our knowledge can only be finite, while our ignorance must necessarily be infinite.