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.
Religion is regarded by the common people as true, by the wise as false, and by rulers as useful.
Charity bestowed upon those who are worthy of it is like good seed sown on a good soil that yields an abundance of fruits. But alms given to those who are yet under the tyrannical yoke of the passions are like seed deposited in a bad soil. The passions of the receiver of the alms choke, as it were, the growth of merits.
Legislators cannot invent too many devices for subdividing property... Another means of silently lessening the inequality of property is to exempt all from taxation below a certain point, and to tax the higher portions of property in geometrical progression as they rise. Whenever there is in any country, uncultivated lands and unemployed poor, it is clear that the laws of property have been so far extended as to violate natural right.
Perhaps I am naive, but I believe that at this point in history, the greatest danger to our freedom and way of life comes from the reasonable fear of omniscient State powers kept in check by nothing more than policy documents.
There is no problem of human nature which is insoluble.
The solution as consumers is - perhaps surprisingly - to take adverts very, very seriously. We should ask ourselves what it is that we find lovely in them - the visions of friendship, togetherness, repose, or whatever. And then consider what would actually help us find these qualities in our lives.
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