When I speak of reason or rationalism, all I mean is the conviction that we can learn through criticism of our mistakes and errors, especially through criticism by others, and eventually also through self-criticism. 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. The emphasis here is on the idea of criticism or, to be more precise, critical discussion. The genuine rationalist does not think that he or anyone else is in possession of the truth; nor does he think that mere criticism as such helps us achieve new ideas. But he does think that, in the sphere of ideas, only critical discussion can help us sort the wheat from the chaff. He is well aware that acceptance or rejection of an idea is never a purely rational matter; but he thinks that only critical discussion can give us the maturity to see an idea from more and more sides and to make a correct judgement of it.
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"On Freedom" in All Life is Problem Solving (1999)Karl Popper
[I]s this not an advantage? Is it not a sign of immense progress that the masses should have "ideas," that is to say, should be cultured? By no means. The "ideas" of the average man are not genuine ideas, nor is their possession culture. An idea is a putting truth in checkmate. Whoever wishes to have ideas must first prepare himself to desire truth and to accept the rules of the game imposed by it. It is no use speaking of ideas when there is no acceptance of a higher authority to regulate them, a series of standards to which it is possible to appeal in a discussion. These standards are the principles on which culture rests.
Jose Ortega y Gasset
As a matter of general principle, I believe there can be no doubt that criticism in time of war is essential to the maintenance of any kind of democratic government ... too many people desire to suppress criticism simply because they think that it will give some comfort to the enemy to know that there is such criticism. If that comfort makes the enemy feel better for a few moments, they are welcome to it as far as I am concerned, because the maintenance of the right of criticism in the long run will do the country maintaining it a great deal more good than it will do the enemy, and will prevent mistakes which might otherwise occur.
Robert Taft
The best colleagues are those who will think about your ideas, who will talk with you and offer insight, constructive criticism. No one needs to be crushed for having a new idea.
Martin Lewis Perl
Learn to control ego. Humans hold their dogmas and biases too tightly, and we only think that our opponents are dogmatic! But we all need criticism. Criticism is the only known antidote to error.
David Brin
What we should do, I suggest, is to give up the idea of ultimate sources of knowledge, and admit that all knowledge is human; that it is mixed with our errors, our prejudices, our dreams, and our hopes; that all we can do is to grope for truth even though it be beyond our reach. We may admit that our groping is often inspired, but we must be on our guard against the belief, however deeply felt, that our inspiration carries any authority, divine or otherwise. If we thus admit that there is no authority beyond the reach of criticism to be found within the whole province of our knowledge, however far it may have penetrated into the unknown, then we can retain, without danger, the idea that truth is beyond human authority. And we must retain it. For without this idea there can be no objective standards of inquiry; no criticism of our conjectures; no groping for the unknown; no quest for knowledge.
Karl Popper
Popper, Karl
Porchia, Antonio
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