I had learnt from experience that many false opinions may be exchanged for true ones, without in the least altering the habits of mind of which false opinions are made.
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Ch. 7: General View of the Remainder of My Life (p. 167)John Stuart Mill
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We are not so absurd as to propose that the teacher should not set forth his own opinions as the true ones and exert his utmost powers to exhibit their truth in the strongest light. To abstain from this would be to nourish the worst intellectual habit of all, that of not finding, and not looking for, certainty in any teacher. But the teacher himself should not be held to any creed; nor should the question be whether his own opinions are the true ones, but whether he is well instructed in those of other people, and, in enforcing his own, states the arguments for all conflicting opinions fairly.
John Stuart Mill
A man who has made up his mind on a given subject twenty-five years ago and continues to hold his political opinions after he has been proved to be wrong is a man of principle; while he who from time to time adapts his opinions to the changing circumstances of life is an opportunist.
A. P. Herbert
If what we are discussing were a point of law or of the humanities, in which neither true nor false exists, one might trust in subtlety of mind and readiness of tongue and in the greater experience of the writers, and expect him who excelled in those things to make his reasoning most plausible, and one might judge it to be the best. But in the natural sciences, whose conclusions are true and necessary and have nothing to do with human will, one must take care not to place oneself in the defense of error; for here a thousand Demostheneses and a thousand Aristotles would be left in the lurch by every mediocre wit who happened to hit upon the truth for himself. Therefore, Simplicio, give up this idea and this hope of yours that there may be men so much more learned, erudite, and well-read than the rest of us as to be able to make that which is false become true in defiance of nature.
Galileo Galilei
The latter part of a wise man’s life is taken up in curing the follies, prejudices, and false opinions he had contracted in the former.
Jonathan Swift
It is more true to say that our opinions depend upon our lives and habits than to say that our lives depend upon our opinions, which is only now and then true.
Frederick William Robertson
Mill, John Stuart
Millar, Fergus
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