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
Interpretation
A rationalist values learning over being right and is open to constructive criticism.
This quote by Karl Popper highlights the essence of rationalism, which prioritizes the pursuit of knowledge and personal growth over the ego of being correct. A rationalist welcomes criticism and differing viewpoints, understanding that true understanding comes from dialogue and the willingness to adapt one's beliefs in the face of new evidence or reasoning.
In practice
In a seminar on critical thinking, one might quote this to highlight the importance of open dialogue.
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.
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 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.
I think his greatest fault is his failure to accord credit to anyone for what he may have done. This is a great weakness in any man.
If others tell us something we make assumptions, and if they don't tell us something we make assumptions to fulfill our need to know and to replace the need to communicate. Even if we hear something and we don't understand we make assumptions about what it means and then believe the assumptions. We make all sorts of assumptions because we don't have the courage to ask questions.
Yield not thy neck_x000D_ _x000D_ To fortune's yoke, but let thy dauntless mind_x000D_ _x000D_ Still ride in triumph over all mischance._x000D_ _x000D_ In the difficult are the friendly forces, the hands_x000D_ _x000D_ that work on us.
If, from time to time, you give up expectation, you will be able to perceive what it is you are getting.
He was one of those men who possess almost every gift, except the gift of the power to use them.
Advice is sometimes transmitted more successfully through a joke than grave teaching.
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