I am opposed to looking upon logic as a kind of game. ... One might think that it is a matter of choice or convention which logic one adopts. I disagree with this view.
Interpretation
Logic is not merely a game or a matter of personal choice; it holds an objective truth.
In this quote, Karl Popper emphasizes the importance of logic as a fundamental aspect of rational thought, suggesting that it should not be treated as arbitrary or optional. He argues against the idea that individuals can simply choose their logical framework, asserting that logic has a more profound and objective basis that must be respected in philosophical and scientific discussions.
In practice
When discussing the foundations of science, you could use this quote to highlight the importance of objective reasoning.
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.
I have been accused of having believed when I wrote Sex and Temperament that there are no sex differences... This, many readers felt, was too much. It was too pretty. I must have found what I was looking for. But this misconception comes from a lack of understanding of what anthropology means, of the open-mindedness with which one must look and listen, record in astonishment and wonder, that which one would not have been able to guess.
Besides this earth, and besides the race of men, there is an invisible world and a kingdom of spirits: that world is around us, for it is everywhere; and those spirits watch us, for they are commissioned to gaurd us; and if we were dying in pain and shame, if scorn smote us on all sides, and hatred crushed us, angels see our tortures, recognize our innocence, and God waits ony a speration of spirit from flesh to crown us with a full reward.
The banyan tree does not mean awakening, nor does the hill, nor the saint, nor the European couple. The lotus is a symbol of regeneration.
In the day-to-day trenches of adult life, there is actually no such thing as atheism. There is no such thing as not worshipping. Everybody worships. The only choice we get is what to worship.
Fictions are necessary for the people, and the Truth becomes deadly to those who are not strong enough to contemplate it in all its brilliance. In fact, what can there be in common between the vile multitude and sublime wisdom? The Truth must be kept secret, and the masses need a teaching proportioned to their imperfect reason.
We grow tyrannical fighting tyranny. . . . The most alarming spectacle today is not the spectacle of the atomic bomb in an unfederated world, it is the spectacle of the Americans beginning to accept the device of loyalty oaths and witch hunts, beginning to call anybody they don't like a Communist.
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