bertrand russell opinions

 “I have been accused of a habit of changing my opinions in philosophy ... I am not myself in any degree ashamed of having changed my opinions .... 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.“

'My Opinions' — preface to The Bertrand Russell Dictionary of Mind, Matter and Morals (1952)

“I have been accused of a habit of changing my opinions in philosophy and, in so far as this is true, the dictionary will enable readers to find it out. 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.