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I believe that the advance of science depends upon the free competition of thought, and thus upon freedom, and that it must come to an end if freedom is destroyed (though it may well continue for some time in some fields, especially in technology).

— Karl Popper The Logic of Scientific Discovery (1934)

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More quotes by Karl Popper

There is no history of mankind, there is only an indefinite number of histories of all kinds of aspects of human life.

The Open Society and Its Enemies (1945)

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

The Open Society and Its Enemies (1945)

Science may be described as the art of systematic over-simplification — the art of discerning what we may with advantage omit.

The Open Universe : An Argument for Indeterminism (1992)

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

Conjectures and Refutations: The Growth of Scientific Knowledge (1963)

All things living are in search of a better world.

In Search of a Better World (1984)

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Quote text and notes from Wikiquote: Karl Popper (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.