The war of ideas is a Greek invention. It is one of the most important inventions ever made. Indeed, the possibility of fighting with with words and ideas instead of fighting with swords is the very basis of our civilization, and especially of all its legal and parliamentary institutions.
Interpretation
Ideas and dialogue are more powerful than violence in shaping civilization.
In this quote, Karl Popper emphasizes the significance of the 'war of ideas' as a foundational aspect of civilization. He suggests that the ability to engage in intellectual discourse and debate, rather than resorting to violence, is what has allowed societies to develop legal structures and democratic institutions, ultimately fostering a more civilized world.
In practice
In a speech on democracy, one might use this quote to advocate for peaceful discourse.
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.
If you can't say it simply and clearly, keep quiet, and keep working on it till you can.
No particular theory may ever be regarded as absolutely certain.... No scientific theory is sacrosanct.
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.
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
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.
Being alone has a power over me that never fails. My interior dissolves (for the time being only superficially) and is ready to release what lies deeper. When I am willfully alone, a slight ordering of my interior begins to take place and I need nothing more.
It is time that scientists and other public intellectuals observed that the contest between faith and reason is zero-sum.
What would have to occur or to have occurred to constitute for you a disproof of the love of, or the existence of, God?
'Tis not need we know our every thought Or see the work shop where each mask is wrought Wherefrom we view the world of box and pit, Careless of wear, just so the mask shall fit And serve our jape's turn for a night or two.
Small acts of decency ripple in ways we could never imagine.
I have a dreadful fear that the more you try to prevent revealing the self the more you do.
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