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| If you want to know your true opinion of someone, watch the effect produced in you by the first sight of a letter from him. | | Arthur Schopenhauer | |
| In all matters of opinion, our adversaries are insane. | | Oscar Wilde | |
| It is as certain that many opinions, now general, will be rejected by future ages, as it is that many, once general, are rejected by the present | | John Stuart Mill | |
| It is just that we should be grateful, not only to those with whose views we may agree, but also to those who have expressed more superficial views; for these also contributed something, by developing before us the powers of thought. | | Aristotle | |
| It requires ages to destroy a popular opinion | | Voltaire | |
| It's the opinion of some that crops could be grown on the moon; which raises the fear that it may not be long before we're paying somebody not to. | | Franklin P. Jones | |
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| One can give a really unbiased opinion only about things that do not interest one | | Oscar Wilde | |
| One often contradicts an opinion when what is uncongenial is really the tone in which it was conveyed. | | Friedrich Nietzsche | |
| One should respect public opinion in so far as is necessary to avoid starvation and to keep out of prison, but anything that goes beyond this is voluntary submission to an unnecessary tyranny | | Bertrand Russell | |
| Opinion governs all mankind, like the blind's leading of the blind | | Samuel Butler | |
| Opinion is that exercise of the human will which helps us to make a decision without information | | John Erskine | |
| Opinion of ghosts, ignorance of second causes, devotion to what men fear, and talking of things casual for prognostics, consisteth the natural seeds of religion | | Thomas Hobbes | |
| Opinions are made to be changed -or how is truth to be got at? | | Lord Byron | |
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| People say I'm cocky, but am I supposed to sit here and be insecure and not know where my future's going or not realize that moviemaking is the greatest thing to happen to me? | | Dale Carnegie | |
| Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. | | John Stuart Mill | |
| Prejudice is a great time saver. You can form opinions without having to get the facts. | | E. B. White | |
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| Public opinion is a weak tyrant, compared with our private opinion - what a man thinks of himself, that is which determines, or rather indicates his fate | | Henry David Thoreau | |
