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Critical power...tends to make an intellectual situation of which the creative power can profitably avail itself. It tends to establish an order of ideas, if not absolutely true, yet true by comparison with that which it displaces; to make the best ideas prevail.

 

Matthew Arnold

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We have no wish to indoctrinate; we want to teach our students to resist indoctrination and not accept as authoritative the beliefs of other men or even the ideas that come to us as in a flash of illumination. Even if one has experiences that some men would call mystical — and I have no doubt that I have had many — it is a matter of integrity to question such experiences and any thoughts that were associated with them as closely and as honestly as we should question the "revelations" of others. To be sure, it is easier to grant others their "revelations" as "true for them" while insisting on one's own as "true for oneself." Such intellectual sluggishness parades as sophistication. But true tolerance does not consist in saying, "You may be right, but let us not make hard demands on ourselves: if you will put your critical intelligence to sleep, I'll put mine to bed, too." True tolerance remains mindful of the humanity of those who make things easy for themselves and welcomes and even loves honest and thoughtful opposition above less thoughtful agreement.

 

Walter (philosopher) Kaufmann

 

A time is marked not so much by ideas that are argued about as by ideas that are taken for granted. The character of an era hangs upon what needs no defense. Power runs with ideas that only the crazy would draw into doubt. The "taken for granted" is the test of sanity; "what everyone knows" is the line between us and them.
This means that sometimes a society gets stuck. Sometimes these unquestioned ideas interfere, as the cost of questioning becomes too great. In these times, the hardest task for social or political activists is to find a way to get people to wonder again about what we all believe is true. The challenge is to sow doubt.

 

Lawrence Lessig

 

Those in possession of absolute power can not only prophesy and make their prophecies come true, but they can also lie and make their lies come true.

 

Eric Hoffer

 

Conservatives feel instinctively that it is new ideas more than anything else that cause change. But, from its point of view rightly, conservatism fears new ideas because it has no distinctive principles of its own to oppose them; and, by its distrust of theory and its lack of imagination concerning anything except that which experience has already proved, it deprives itself of the weapons needed in the struggle of ideas. Unlike liberalism, with its fundamental belief in the long-range power of ideas, conservatism is bound by the stock of ideas inherited at a given time. And since it does not really believe in the power of argument, its last resort is generally a claim to superior wisdom, based on some self-arrogated superior quality.

 

Friedrich Hayek

 

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.

 

Karl Popper