1
" I have been accused of a habit of changing my opinions. I am not myself in any degree ashamed of having changed my opinions. What physicist who was already active in 1900 would dream of boasting that his opinions had not changed during the last half century? In science men change their opinions when new knowledge becomes available; but philosophy in the minds of many is assimilated rather to theology than to science. The kind of philosophy that I value and have endeavoured to pursue is scientific, in the sense that there is some definite knowledge to be obtained and that new discoveries can make the admission of former error inevitable to any candid mind. For what I have said, whether early or late, I do not claim the kind of truth which theologians claim for their creeds. I claim only, at best, that the opinion expressed was a sensible one to hold at the time when it was expressed. I should be much surprised if subsequent research did not show that it needed to be modified. I hope, therefore, that whoever uses this dictionary will not suppose the remarks which it quotes to be intended as pontifical pronouncements, but only as the best I could do at the time towards the promotion of clear and accurate thinking. Clarity, above all, has been my aim. "
― Bertrand Russell , Dictionary of Mind, Matter & Morals
20
" [I retained] only the Habit of expressing my self in Terms of modest Diffidence, never using when I advance any thing that may possibly be disputed, the Words 'Certainly, 'undoubtedly', or any others that I give the Air of Positiveness to an Opinion; but rather say 'I conceive', or 'I apprehend a Thing to be so or so', 'It appears to me', or 'I should think it so or so for such & such Reasons', or 'I imagine' it to be so or so, or 'it is so' if I am not mistaken.—This Habit I believe has been of great Advantage to me, when I have had occasion to inculcate my Opinions and persuade Men into Measures that I have been from time to time engag'd in promoting.—And as the chief Ends of Conversation are to inform, or to be informed, to please or to persuade, I wish well meaning sensible Men would not lessen their Power of doing Good by a Positive assuming Manner that seldom fails to disgust, tends to create Opposition, and to defeat every one of those purposes for which Speech was given to us, to wit, giving or receiving Information or Pleasure: For if you would inform, a positive dogmatical Manner in advancing your Sentiments, may provoke Contradiction & prevent a candid Attention. "
― Benjamin Franklin , The Autobiography of Benjamin Franklin