“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.”

Cross v. Glode (1797), 2 Esp. 575.

Letter to Colonel Charles Yancey http://oll.libertyfund.org/?option=com_staticxt&staticfile=show.php%3Ftitle=807&chapter=88152&layout=html&Itemid=27 (6 January 1816) ME 14:384
1810s

Speech at a Republican Banquet, Chicago, Illinois, December 10, 1856 http://quod.lib.umich.edu/l/lincoln/lincoln2/1:413?rgn=div1;view=fulltext; see Roy P. Basler, ed., The Collected Works of Abraham Lincoln, vol. 2 (New Brunswick, N.J.: Rutgers University Press, 1953), p. 532
1850s
Context: Our government rests in public opinion. Whoever can change public opinion, can change the government, practically just so much.

Advertisement to the Second Edition, p. vii
Principles of Political Economy (Second Edition 1836)

1790s, The Age of Reason, Part I (1794)

Source: Speech at a Republican Banquet, Chicago, Illinois, December 10, 1856 http://quod.lib.umich.edu/l/lincoln/lincoln2/1:413?rgn=div1;view=fulltext; see Roy P. Basler, ed., The Collected Works of Abraham Lincoln, vol. 2 (New Brunswick, N.J.: Rutgers University Press, 1953), p. 532

Source: The Statesman (1836), Ch. 17. p. 121

Ben Stein interviewed by Paul Crouch Jr. on Trinity Broadcasting Network, First To Know with Paul Crouch Jr., April 21, 2008, 21 April 2008, 2011-12-19 http://www.tbn.org/video_portal/?which=bts,