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It is easy to obtain confirmations, or verifications, for nearly every theory-if we look for confirmations. Confirmations should count only if they are the result of risky predictions... A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think) but a vice. Every genuine test of a theory is an attempt to falsify it, or refute it.
Karl Popper
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Interpretation

What this quote means

The quote emphasizes the importance of falsifiability in scientific theories over mere confirmations.

Karl Popper argues that a scientific theory must be falsifiable, meaning that it should be possible to conceive an event that would prove it wrong. Merely finding confirmations for a theory does not validate it; rather, the strength of a scientific theory lies in its ability to withstand rigorous testing and the potential to be disproven.

Themes

TheoryFalsifiabilityScienceConfirmationVerificationPrediction

In practice

Example use cases

During a lecture on scientific methodology, one can use this quote to illustrate the core principle of falsifiability.

More from Karl Popper

The growth of our knowledge is the result of a process closely resembling what Darwin called 'natural selection'; that is, the natural selection of hypotheses: our knowledge consists, at every moment, of those hypotheses which have shown their (comparative) fitness by surviving so far in their struggle for existence, a competitive struggle which eliminates those hypotheses which are unfit.
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If you can't say it simply and clearly, keep quiet, and keep working on it till you can.
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No particular theory may ever be regarded as absolutely certain.... No scientific theory is sacrosanct.
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The belief in a political Utopia is especially dangerous. This is possibly connected with the fact that the search for a better world, like the investigation of our environment, is (if I am correct) one of the oldest and most important of all the instincts.
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A rationalist is simply someone for whom it is more important to learn than to be proved right; someone who is willing to learn from others - not by simply taking over another's opinions, but by gladly allowing others to criticize his ideas and by gladly criticizing the ideas of others
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Thus science must begin with myths, and with the criticism of myths; neither with the collection of observations, nor with the invention of experiments, but with the critical discussion of myths, and of magical techniques and practices.
Karl PopperRead

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