“There is a principle which is a bar against all information, which is proof against all arguments and which cannot fail to keep a man in everlasting ignorance — that principle is contempt prior to investigation.”
Commonly attributed to Spencer, information provided in The Quote Verifier: Who Said What, Where, and When (2006) by Ralph Keyes and The Survival of a Fitting Quotation. (2005) by Michael StGeorge http://anonpress.org/spencer/, indicates the attribution may have originated with the book [w:The_Big_Book_(Alcoholics_Anonymous)|Alcoholics Anonymous]]. It was used exactly as written above in the personal stories section of the first edition in 1939 and in 'Appendix II: Spiritual Experience' of all subsequent editions.
: "Contempt prior to examination" was a phrase used by William Paley, the 18th-century English Christian apologist. In A View of the Evidences of Christianity (1794), he wrote:
::The infidelity of the Gentile world, and that more especially of men of rank and learning in it, is resolved into a principle which, in my judgment, will account for the inefficacy of any argument, or any evidence whatever, viz. contempt prior to examination.
:Paley's characterization of non-believers was later modified and used by other religious authors who uniformly attributed their words to Paley. In Anglo-Israel or, The British Nation: The lost Tribes of Israel (1879), Rev. William H. Poole may have been the first to render the quotation in its more familiar and enduring form:
::There is a principle which is a bar against all information, which is proof against all argument, and which cannot fail to keep a man in everlasting ignorance. This principle is, contempt prior to examination.
:Various authors following Rev. Poole would offer new iterations of the quotation into the early decades of the 20th century. Most of these credited William Paley, but by the early 1930s the first obscure publications to falsely attribute this quote to Spencer emerged. Its usage for decades since as a maxim in Alcoholics Anonymous and the twelve-step recovery community has popularized its erroneous association with Herbert Spencer.
Misattributed
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Herbert Spencer 81
English philosopher, biologist, sociologist, and prominent … 1820–1903Related quotes

“Contempt prior to investigation is what enslaves a mind to Ignorance.”
This or similar statements are more often misattributed to Herbert Spencer, but the source of the phrase "contempt prior to investigation" seems to have been William Paley, A View of the Evidences of Christianity (1794): "The infidelity of the Gentile world, and that more especially of men of rank and learning in it, is resolved into a principle which, in my judgment, will account for the inefficacy of any argument, or any evidence whatever, viz. contempt prior to examination."
Misattributed

Bishop urges Catholic groups to renege after they signed Trudeau’s pro-abortion pledge https://www.lifesitenews.com/news/bishop-urges-catholic-groups-to-renege-after-they-signed-trudeaus-pro-abort (May 3, 2018)

Kant's Inaugural Dissertation (1770), Section III On The Principles Of The Form Of The Sensible World

Speech given by Johnson at Lloyd's of London in 2006, quoted in * 2007-07-18
Boris Johnson inspired by Jaws mayor
Graeme Wilson and George Jones
The Telegraph
https://www.telegraph.co.uk/news/uknews/1557765/Boris-Johnson-inspired-by-Jaws-mayor.html
2000s, 2006

“I am a man of fixed and unbending principles, the first of which is to be flexible at all times.”
As quoted in Caught Between the Dog and the Fireplug, or, How to Survive Public Service (2001) by Kenneth H. Ashworth, p. 11

Textual Criticism of the Hebrew Bible, 3rd ed. (2012), p.272

Letter to Thomas Jefferson, 28 June 1813. Often misquoted as "The general principles on which the fathers achieved independence were the general principles of Christianity"
1810s
Context: The general principles on which the fathers achieved independence, were … the general principles of Christianity, in which all those sects were united, and the general principles of English and American liberty, in which all those young men united, and which had united all parties in America, in majorities sufficient to assert and maintain her independence. Now I will avow, that I then believed and now believe that those general principles of Christianity are as eternal and immutable as the existence and attributes of God; and that those principles of liberty are as unalterable as human nature and our terrestrial, mundane system.

An account of the European Settlements in America (1757), pp. 19-20, in The Works of Edmund Burke in Nine Volumes, Vol. IX. Boston: Little, Brown (1839)
1750s