“The diversity of physical arguments and opinions embraces all sorts of methods.”

"The Character of a Methodist" (1739); in The Works of the Rev. John Wesley in Ten Volumes (1826), Volume IV, p. 407; A portion of this is commonly quoted as "Think and let think.".
General sources
Context: The distinguishing marks of a Methodist are not his opinions of any sort. His assenting to this or that scheme of Religion, his embracing any particular set of notions, his espousing the judgment of one man or of another, are all quite wide of the point. Whosoever therefore imagines, that a Methodist is a man of such or such an opinion, is grossly ignorant of the whole affair; he mistakes the truth totally. We believe indeed, that all Scripture is given by the inspiration of God, and herein we are distinguished from Jews, Turks, and Infidels. We believe the written word of God to be the only and sufficient rule, both of Christian faith and practice; and herein we are fundamentally distinguished from those of the Romish church. We believe Christ to be the eternal, supreme God; and herein we are distinguished from the Socinians and Arians. But as to all opinions which do not strike at the root of Christianity, we think and let think. So that whatsoever they are, whether right or wrong, they are no distinguishing marks of a; Methodist.

Lovell v. City of Griffin, 303 U.S. 444 (1938).
Judicial opinions

Ostriker, J.P. and Mitton, Simon (2013) Heart of Darkness p.9.
De Magnete (1600), quote about science

An Epic Interview with John Roecker, FilmJerk, www.filmjerk.com, Kristopher, Terrell, August 23, 2003 http://www.filmjerk.com/interviews/article.php?id_int=12,

1970s, Synergetics: Explorations in the Geometry of Thinking (1975), The Wellspring of Reality

Source: The Salmon of Doubt (2002)

Report on Manufactures (1791)
Context: The expediency of encouraging manufactures in the United States, which was not long since deemed very questionable, appears at this time to be pretty generally admitted. (...) There still are, nevertheless, respectable patrons of opinions, unfriendly to the encouragement of manufactures. The following are, substantially, the arguments, by which these opinions are defended. (...) “In every country (say those who entertain them,) Agriculture is the most beneficial and productive object of human industry. (...) To endeavor by the extraordinary patronage of Government, to accelerate the growth of manufactures, is in fact, to endeavor, by force and art, to transfer the natural current of industry, from a more, to a less beneficial channel. Whatever has such a tendency must necessarily be unwise. Indeed it can hardly ever be wise in a government, to attempt to give a direction to the industry of its citizens. This under the quick-sighted guidance of private interest, will, if left to itself, infallibly find its own way to the most profitable employment; and it is by such employment, that the public prosperity will be most effectually promoted. To leave industry to itself, therefore, is, in almost every case, the soundest as well as the simplest policy.” This policy is not only recommended to the United States, by considerations which affect all nations, it is, in a manner, dictated to them by the imperious force of a very peculiar situation.

Education for All People and Education for Life

Source: During an interview with Y Combinator - Published on Dec 6, 2018.