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Freethought or free thought is a philosophical viewpoint which holds that positions regarding truth should be formed on the basis of logic, reason, and empiricism, rather than authority, tradition, revelation, or other dogma. The cognitive application of freethought is known as "freethinking", and practitioners of freethought are known as "freethinkers". The term first came into use in the 17th century to indicate people who inquired into the basis of traditional religious beliefs.
A free thinker is defined as a person who forms his or her own opinions about important subjects (such as religion and politics) instead of accepting what others say. Freethinkers are heavily committed to the use of scientific inquiry, and logic. The skeptical application of science implies freedom from the intellectually limiting effects of confirmation bias, cognitive bias, conventional wisdom, popular culture, prejudice, or sectarianism.
Atheist author Adam Lee defines freethought as thinking independent of revelation, tradition, established belief, and authority, also defining it as a "broader umbrella" than atheism "that embraces a rainbow of unorthodoxy, religious dissent, skepticism, and unconventional thinking."
The basic summarizing statement of the essay The Ethics of Belief by the 19th-century British mathematician and philosopher William Kingdon Clifford is: "It is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence." The essay became a rallying cry for freethinkers when published in the 1870s, and has been described as a point when freethinkers grabbed the moral high ground. Clifford was himself an organizer of freethought gatherings, the driving force behind the Congress of Liberal Thinkers held in 1878.
Regarding religion, freethinkers often hold that there is insufficient evidence to support the existence of supernatural phenomena. According to the Freedom from Religion Foundation, "No one can be a freethinker who demands conformity to a bible, creed, or messiah. To the freethinker, revelation and faith are invalid, and orthodoxy is no guarantee of truth." and "Freethinkers are convinced that religious claims have not withstood the tests of reason. Not only is there nothing to be gained by believing an untruth, but there is everything to lose when we sacrifice the indispensable tool of reason on the altar of superstition. Most freethinkers consider religion to be not only untrue, but harmful."
However, philosopher Bertrand Russell in his 1957 essay "The Value of Free Thought" wrote
What makes a freethinker is not his beliefs but the way in which he holds them. If he holds them because his elders told him they were true when he was young, or if he holds them because if he did not he would be unhappy, his thought is not free; but if he holds them because, after careful thought he finds a balance of evidence in their favour, then his thought is free, however odd his conclusions may seem.
Fred Edwords, former executive of the American Humanist Association, suggests that by Russell's definition, even liberal religionists who have challenged established orthodoxies might be considered freethinkers.
In the 18th and 19th century, many thinkers regarded as freethinkers were deists, arguing that the nature of God can only be known from a study of nature rather than from religious revelation. In the 18th century, "deism" was as much of a 'dirty word' as "atheism", and deists were often stigmatized as either atheists or at least as freethinkers by their Christian opponents. Deists today regard themselves as freethinkers, but are now arguably less prominent in the freethought movement than atheists.
The pansy serves as the long-established and enduring symbol of freethought; literature of the American Secular Union inaugurated its usage in the late 1800s. The reasoning behind the pansy as the symbol of freethought lies both in the flower's name and in its appearance. The pansy derives its name from the French word pensée, which means "thought". It allegedly received this name because the flower is perceived by some to bare resemblance to a human face, and in mid-to-late summer it nods forward as if deep in thought.
Critical thought has flourished in the Hellenistic Mediterranean, in the repositories of knowledge and wisdom in Ireland and in the Iranian civilizations (for example in the era of Khayyam (1048–1131) and his unorthodox Sufi Rubaiyat poems), and in other civilizations, such as the Chinese (note for example the seafaring renaissance of the Southern Song dynasty of 420–479), and on through heretical thinkers on esoteric alchemy or astrology, to the Renaissance and the Protestant Reformation.
French physician and writer Rabelais celebrated "rabelaisian" freedom as well as good feasting and drinking (an expression and a symbol of freedom of the mind) in defiance of the hypocrisies of conformist orthodoxy in his utopian Thelema Abbey (from θέλημα: free "will"), the device of which was Do What Thou Wilt:
"So had Gargantua established it. In all their rule and strictest tie of their order there was but this one clause to be observed, Do What Thou Wilt; because free people ... act virtuously and avoid vice. They call this honor."
When Rabelais's hero Pantagruel journeys to the "Oracle of The Div(in)e Bottle", he learns the lesson of life in one simple word: "Trinch!", Drink! Enjoy the simple life, learn wisdom and knowledge, as a free human. Beyond puns, irony, and satire, Gargantua's prologue-metaphor instructs the reader to "break the bone and suck out the substance-full marrow" ("la substantifique moëlle"), the core of wisdom.
The term free-thinker emerged toward the end of the 17th century in England to describe those who stood in opposition to the institution of the Church, and of literal belief in the Bible. The beliefs of these individuals were centered on the concept that people could understand the world through consideration of nature. Such positions were formally documented for the first time in 1697 by William Molyneux in a widely publicized letter to John Locke, and more extensively in 1713, when Anthony Collins wrote his Discourse of Free-thinking, which gained substantial popularity. This essay attacks clergy of all churches and is a plea for deism.
The Freethinker magazine was first published in Britain in 1881.
In France, the concept first appeared in publication in 1765 when Denis Diderot, Jean le Rond d'Alembert, and Voltaire included an article on Liberté de penser in their Encyclopédie. The European freethought concepts spread so widely that even places as remote as the Jotunheimen, in Norway, had well-known freethinkers such as Jo Gjende by the 19th century.
François-Jean Lefebvre de la Barre (September 12, 1745 – July 1, 1766) was a young French nobleman, famous for having been tortured and beheaded before his body was burnt on a pyre along with Voltaire's Philosophical Dictionary. La Barre is often said to have been executed for not saluting a Roman Catholic religious procession, but the elements of the case were far more complex.
In France, Lefebvre de la Barre is widely regarded a symbol of the victims of Christian religious intolerance; La Barre along with Jean Calas and Pierre-Paul Sirven, was championed by Voltaire. A second replacement statue to de la Barre stands nearby the Basilica of the Sacred Heart of Jesus of Paris at the summit of the butte Montmartre (itself named from the Temple of Mars), the highest point in Paris and an 18th arrondissement street nearby the Sacré-Cœur is also named after Lefebvre de la Barre.
In Germany, during the period 1815–1848 and before the March Revolution, the resistance of citizens against the dogma of the church increased. In 1844, under the influence of Johannes Ronge and Robert Blum, belief in the rights of man, tolerance among men, and humanism grew, and by 1859 they had established the Bund Freireligiöser Gemeinden Deutschlands (literally Union of Free Religious Communities of Germany), an association of persons who consider themselves to be religious without adhering to any established and institutionalized church or sacerdotal cult. This union still exists today, and is included as a member in the umbrella organization of free humanists. In 1881 in Frankfurt am Main, Ludwig Büchner established the Deutscher Freidenkerbund (German Freethinkers League) as the first German organization for atheists and agnostics. In 1892 the Freidenker-Gesellschaft and in 1906 the Deutscher Monistenbund were formed.
Freethought organizations developed the "Jugendweihe" (literally Youth consecration), a secular "confirmation" ceremony, and atheist funeral rites. The Union of Freethinkers for Cremation was founded in 1905, and the Central Union of German Proletariat Freethinker in 1908. The two groups merged in 1927, becoming the German Freethinking Association in 1930.
More "bourgeois" organizations declined after World War I, and "proletarian" Freethought groups proliferated, becoming an organization of socialist parties. European socialist freethought groups formed the International of Proletarian Freethinkers (IPF) in 1925. Activists agitated for Germans to disaffiliate from their respective Church and for seculari-zation of elementary schools; between 1919–21 and 1930–32 more than 2.5 million Germans, for the most part supporters of the Social Democratic and Communist parties, gave up church membership. Conflict developed between radical forces including the Soviet League of the Militant Godless and Social Democratic forces in Western Europe led by Theodor Hartwig and Max Sievers. In 1930 the Soviet and allied delegations, following a walk-out, took over the IPF and excluded the former leaders. Following Hitler's rise to power in 1933, most freethought organizations were banned, though some right-wing groups that worked with so-called Völkische Bünde (literally "ethnic" associations with nationalist, xenophobic and very often racist ideology) were tolerated by the Nazis until the mid-1930s.
The Université Libre de Bruxelles and the Vrije Universiteit Brussel, along with the two Circles of Free Inquiry (Dutch and French speaking), defend the freedom of critical thought, lay philosophy and ethics, while rejecting the argument of authority.
In the Netherlands, freethought has existed in organized form since the establishment of De Dageraad (now known as De Vrije Gedachte) in 1856. Among its most notable subscribing 19th century individuals were Johannes van Vloten, Multatuli, Adriaan Gerhard and Domela Nieuwenhuis.
In 2009, Frans van Dongen established the Atheist-Secular Party, which takes a considerably restrictive view of religion and public religious expressions.
Since the 19th century, Freethought in the Netherlands has become more well known as a political phenomenon through at least three currents: liberal freethinking, conservative freethinking, and classical freethinking. In other words, parties which identify as freethinking tend to favor non-doctrinal, rational approaches to their preferred ideologies, and arose as secular alternatives to both clerically aligned parties as well as labor-aligned parties. Common themes among freethinking political parties are "freedom", "liberty", and "individualism".
The Free Thought movement first organized itself in the United States of America as the "Free Press Association" in 1827 in defense of George Houston, publisher of The Correspondent, an early journal of Biblical criticism in an era when blasphemy convictions were still possible. Houston had helped found an Owenite community at Haverstraw, New York in 1826–27. The short-lived Correspondent was superseded by the Free Enquirer, the official organ of Robert Owen's New Harmony community in Indiana, edited by Robert Dale Owen and by Fanny Wright between 1828 and 1832 in New York. During this time Robert Dale Owen sought to introduce the philosophic skepticism of the Free Thought movement into the Workingmen's Party in New York City. The Free Enquirer's annual civic celebrations of Paine's birthday after 1825 finally coalesced in 1836 in the first national Free Thinkers organization, the "United States Moral and Philosophical Society for the General Diffusion of Useful Knowledge". It was founded on August 1, 1836, at a national convention at the Lyceum in Saratoga Springs with Isaac S. Smith of Buffalo, New York, as president. Smith was also the 1836 Equal Rights Party's candidate for Governor of New York and had also been the Workingmen's Party candidate for Lt. Governor of New York in 1830. The Moral and Philosophical Society published The Beacon, edited by Gilbert Vale.
Driven by the revolutions of 1848 in the German states, the 19th century saw an immigration of German freethinkers and anti-clericalists to the United States (see Forty-Eighters). In the United States, they hoped to be able to live by their principles, without interference from government and church authorities.
These groups of German Freethinkers referred to their organizations as Freie Gemeinden, or "free congregations". The first Freie Gemeinde was established in St. Louis in 1850. Others followed in Pennsylvania, California, Washington, D.C., New York, Illinois, Wisconsin, Texas, and other states.
Freethinkers tended to be liberal, espousing ideals such as racial, social, and sexual equality, and the abolition of slavery.
The "Golden Age of Freethought" in the US came in the late 1800s. The dominant organization was the National Liberal League which formed in 1876 in Philadelphia. This group re-formed itself in 1885 as the American Secular Union under the leadership of the eminent agnostic orator Robert G. Ingersoll. Following Ingersoll's death in 1899 the organization declined, in part due to lack of effective leadership.
Freethought in the United States declined in the early twentieth century. Its anti-religious views alienated would-be sympathizers. The movement also lacked cohesive goals or beliefs. By the early twentieth century, most Freethought congregations had disbanded or joined other mainstream churches. The longest continuously operating Freethought congregation in America is the Free Congregation of Sauk County, Wisconsin, which was founded in 1852 and is still active as of 2016[update]. It affiliated with the American Unitarian Association (now the Unitarian Universalist Association) in 1955. D. M. Bennett was the founder and publisher of The Truth Seeker in 1873, a radical freethought and reform American periodical.
German Freethinker settlements were located in:
- Burlington, Racine County, Wisconsin
- Belleville, St. Clair County, Illinois
- Castell, Llano County, Texas
- Comfort, Kendall County, Texas
- Fond du Lac, Fond du Lac County, Wisconsin
- Frelsburg, Colorado County, Texas
- Hermann, Gasconade County, Missouri
- Jefferson, Jefferson County, Wisconsin
- Indianapolis, Indiana
- Latium, Washington County, Texas
- Manitowoc, Manitowoc County, Wisconsin
- Meyersville, DeWitt County, Texas
- Milwaukee, Wisconsin
- Millheim, Austin County, Texas
- Oshkosh, Winnebago County, Wisconsin
- Ratcliffe, DeWitt County, Texas
- Sauk City, Sauk County, Wisconsin
- Shelby, Austin County, Texas
- Sisterdale, Kendall County, Texas
- St. Louis, Missouri
- Tusculum, Kendall County, Texas
- Two Rivers, Manitowoc County, Wisconsin
- Watertown, Dodge County, Wisconsin
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The earliest known secular organization in English Canada is the Toronto Freethought Association, founded in 1873 by a handful of secularists. Reorganized in 1877 and again in 1881, when it was renamed the Toronto Secular Society, the group formed the nucleus of the Canadian Secular Union, established in 1884 to bring together freethinkers from across the country.
A significant number of the early members appear to have been drawn from the educated labour "aristocracy," including Alfred F. Jury, J. Ick Evans and J. I. Livingstone, all of whom were leading labour activists and secularists. The second president of the Toronto association was T. Phillips Thompson, a central figure in the city's labour and social reform movements during the 1880s and 1890s and arguably Canada's foremost late nineteenth-century labour intellectual. By the early 1880s, freethought organizations were scattered throughout southern Ontario and parts of Quebec, and elicited both urban and rural support.
The principal organ of the freethought movement in Canada was Secular Thought (Toronto, 1887–1911). Founded and edited by English freethinker Charles Watts (1835–1906) during its first several years, the editorship was assumed by Toronto printer and publisher James Spencer Ellis in 1891 when Watts returned to England.
In 1968 the Humanist Association of Canada was formed to serve as an umbrella group for Humanists, atheists, freethinkers, and to champion social justice issues and oppose religious influence on public policy—most notably in the fight to make access to abortion free and legal in Canada. HAC, also known as Humanist Canada, is an active voice for Humanism in Canada and supports the activities of groups who wish to raise awareness about secular issues.
The Canadian Secular Alliance is an active community.
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In the United States, "freethought was a basically anti-christian, anti-clerical movement, whose purpose was to make the individual politically and spiritually free to decide for himself on religious matters. A number of contributors to Liberty were prominent figures in both freethought and anarchism. The individualist anarchist George MacDonald was a co-editor of Freethought and, for a time, The Truth Seeker. E.C. Walker was co-editor of the freethought/free love journal Lucifer, the Light-Bearer." "Many of the anarchists were ardent freethinkers; reprints from freethought papers such as Lucifer, the Light-Bearer, Freethought and The Truth Seeker appeared in Liberty...The church was viewed as a common ally of the state and as a repressive force in and of itself."
In Europe, a similar development occurred in French and Spanish individualist anarchist circles. "Anticlericalism, just as in the rest of the libertarian movement, in another of the frequent elements which will gain relevance related to the measure in which the (French) Republic begins to have conflicts with the church...Anti-clerical discourse, frequently called for by the French individualist André Lorulot, will have its impacts in Estudios (a Spanish individualist anarchist publication). There will be an attack on institutionalized religion for the responsibility that it had in the past on negative developments, for its irrationality which makes it a counterpoint of philosophical and scientific progress. There will be a criticism of proselitism and ideological manipulation which happens on both believers and agnostics". These tendencies will continue in French individualist anarchism in the work and activism of Charles-Auguste Bontemps and others. In the Spanish individualist anarchist magazines Ética and Iniciales "there is a strong interest in publishing scientific news, usually linked to a certain atheist and anti-theist obsession, philosophy which will also work for pointing out the incompatibility between science and religion, faith, and reason. In this way there will be a lot of talk on Darwin´s theories or on the negation of the existence of the soul".
In 1901, Catalan anarchist and freethinker Francesc Ferrer i Guàrdia established "modern" or progressive schools in Barcelona in defiance of an educational system controlled by the Catholic Church. The schools' stated goal was to "educate the working class in a rational, secular and non-coercive setting". Fiercely anti-clerical, Ferrer believed in "freedom in education", education free from the authority of church and state. Ferrer's ideas generally, formed the inspiration for a series of Modern Schools in the United States, Cuba, South America and London. The first of these was started in New York City in 1911. It also inspired the Italian newspaper Università popolare, founded in 1901.
- Age of Enlightenment
- Brights movement
- Camp Quest
- Conflict thesis
- Critical rationalism
- Critical thinking
- Ethical movement
- Freedom from Religion Foundation
- Freedom of thought
- Freethought Association of Canada
- Freethought Day
- GAMPAC (Godless Americans PAC)
- Golden Age of Freethought
- Internet Infidels
- Naturalism (philosophy)
- Naturalistic pantheism
- Occam's razor
- Philosophical theism
- Religious skepticism
- Secular humanism
- Secular Review
- Secular Thought
- Spiritual but not religious
- The Freethinker (journal)
- Unitarian Universalism
Notes and references
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- "Free thought - Define Free thought at Dictionary.com". Dictionary.com. Retrieved 12 June 2015.
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- "What Is Freethought?". Daylight Atheism. Retrieved 12 June 2015.
- Adam Lee. "9 Great Freethinkers and Religious Dissenters in History". Big Think. Retrieved 12 June 2015.
- William Kingdon Clifford, The Ethics of Belief (1879 ).
- Becker, Lawrence and Charlotte (2013). Encyclopedia of Ethics (article on "agnosticism"). Routledge. p. 44. ISBN 9781135350963.
- Hastings, James. Encyclopedia of Religion.
- "What is a Freethinker? - Freedom From Religion Foundation". Retrieved 12 June 2015.
- "Saga Of Freethought And Its Pioneers". American Humanist Association. Retrieved 12 June 2015.
- James E. Force, Introduction (1990) to An Account of the Growth of Deism in England (1696) by William Stephens
- Aveling, Francis, ed. (1908). "Deism". The Catholic Encyclopedia. Retrieved 2012-10-10.
The deists were what nowadays would be called freethinkers, a name, indeed, by which they were not infrequently known; and they can only be classed together wholly in the main attitude that they adopted, viz. in agreeing to cast off the trammels of authoritative religious teaching in favour of a free and purely rationalistic speculation.... Deism, in its every manifestation was opposed to the current and traditional teaching of revealed religion.
- A Pansy For Your Thoughts, by Annie Laurie Gaylor, Freethought Today, June/July 1997
- Chinese History – Song Dynasty 宋 (www.chinaknowledge.de)
- Gatti, Hilary (2002). Giordano Bruno and Renaissance Science: Broken Lives and Organizational Power. Ithaca, New York: Cornell University Press. pp. 18–19. Retrieved 21 March 2014.
For Bruno was claiming for the philosopher a principle of free thought and inquiry which implied an entirely new concept of authority: that of the individual intellect in its serious and continuing pursuit of an autonomous inquiry… It is impossible to understand the issue involved and to evaluate justly the stand made by Bruno with his life without appreciating the question of free thought and liberty of expression. His insistence on placing this issue at the center of both his work and of his defense is why Bruno remains so much a figure of the modern world. If there is, as many have argued, an intrinsic link between science and liberty of inquiry, then Bruno was among those who guaranteed the future of the newly emerging sciences, as well as claiming in wider terms a general principle of free thought and expression.
- Montano, Aniello (24 November 2007). Antonio Gargano, ed. Le deposizioni davanti al tribunale dell'Inquisizione. Napoli: La Città del Sole. p. 71.
In Rome, Bruno was imprisoned for seven years and subjected to a difficult trial that analyzed, minutely, all his philosophical ideas. Bruno, who in Venice had been willing to recant some theses, become increasingly resolute and declared on 21 December 1599 that he 'did not wish to repent of having too little to repent, and in fact did not know what to repent.' Declared an unrepentant heretic and excommunicated, he was burned alive in the Campo dei Fiori in Rome on 17 February 1600. On the stake, along with Bruno, burned the hopes of many, including philosophers and scientists of good faith like Galileo, who thought they could reconcile religious faith and scientific research, while belonging to an ecclesiastical organization declaring itself to be the custodian of absolute truth and maintaining a cultural militancy requiring continual commitment and suspicion.
- Birx, James (11 November 1997). "Giordano Bruno". Mobile Alabama Harbinger. Retrieved 28 April 2014.
To me, Bruno is the supreme martyr for both free thought and critical inquiry… Bruno's critical writings, which pointed out the hypocrisy and bigotry within the Church, along with his tempestuous personality and undisciplined behavior, easily made him a victim of the religious and philosophical intolerance of the 16th century. Bruno was excommunicated by the Catholic, Lutheran and Calvinist Churches for his heretical beliefs. The Catholic hierarchy found him guilty of infidelity and many errors, as well as serious crimes of heresy… Bruno was burned to death at the stake for his pantheistic stance and cosmic perspective.
- "ARTFL Encyclopédie Search Results". Retrieved 12 June 2015.
- "Gjendesheim". MEMIM. 2016. Archived from the original on 8 August 2016. Retrieved 8 August 2016.
- Gregory, Mary Efrosini (2008). Evolutionism in Eighteenth-century French Thought. Peter Lang. p. 192. ISBN 9781433103735. Retrieved 1 September 2016.
- Bock, Heike (2006). "Secularization of the modern conduct of life? Reflections on the religiousness of early modern Europe". In Hanne May. Religiosität in der säkularisierten Welt. VS Verlag fnr Sozialw. p. 157. ISBN 3-8100-4039-8.
- Reese, Dagmar (2006). Growing up female in Nazi Germany. Ann Arbor, Mich: University of Michigan Press. p. 160. ISBN 0-472-06938-1.
- Reinhalter, Helmut (1999). "Freethinkers". In Bromiley, Geoffrey William; Fahlbusch, Erwin. The encyclopedia of Christianity. Grand Rapids, MI: Wm. B. Eerdmans. ISBN 90-04-11695-8.
- Kaiser, Jochen-Christoph (2003). Christel Gärtner, ed. Atheismus und religiöse Indifferenz. Organisierter Atheismus. VS Verlag. ISBN 978-3-8100-3639-1.
- Peris, Daniel (1998). Storming the heavens: the Soviet League of the Militant Godless. Ithaca, N.Y: Cornell University Press. pp. 110–11. ISBN 0-8014-3485-8.
- Lamberti, Marjorie (2004). Politics Of Education: Teachers and School Reform in Weimar Germany (Monographs in German History). Providence: Berghahn Books. p. 185. ISBN 1-57181-299-7.
- Hugins, Walter (1960). Jacksonian Democracy and the Working Class: A Study of the New York Workingmen's Movement 1829-1837. Stanford: Stanford University Press. pp. 36–48.
- Brandt, Eric T., and Timothy Larsen (2011). "The Old Atheism Revisited: Robert G. Ingersoll and the Bible". Journal of the Historical Society. 11 (2): 211–238. doi:10.1111/j.1540-5923.2011.00330.x.
- "Freethinkers in Wisconsin". Dictionary of Wisconsin History. 2008. Retrieved 2008-07-27.
- Demerath, N. J. III and Victor Thiessen, "On Spitting Against the Wind: Organizational Precariousness and American Irreligion," The American Journal of Sociology, 71: 6 (May, 1966), 674–687.
- "National Liberal League". The Freethought Trail. freethought-trail.org. Retrieved 9 March 2014.
- "History of the Free Congregation of Sauk County: The "Freethinkers" Story". Free Congregation of Sauk County. April 2009. Retrieved 2012-02-05.
- "The Turners, Forty-eighters and Freethinkers". Freedom from Religion Foundation. July 2002. Retrieved 2008-07-27.
- "The Journal of Libertarian Studies" (PDF). Mises Institute. Retrieved 12 June 2015.
- Xavier Diez. El anarquismo individualista en España (1923-1939) Virus Editorial. 2007. pg. 143
- Xavier Diez. El anarquismo individualista en España (1923-1939) Virus Editorial. 2007. pg. 152
- Geoffrey C. Fidler (Spring–Summer 1985). "The Escuela Moderna Movement of Francisco Ferrer: "Por la Verdad y la Justicia"". History of Education Quarterly. History of Education Society. 25 (1/2): 103–132. doi:10.2307/368893. JSTOR 368893.
- "Francisco Ferrer's Modern School". Flag.blackened.net. Retrieved 2010-09-20.
- Jacoby, Susan (2004). Freethinkers: a history of American secularism. New York: Metropolitan Books. ISBN 0-8050-7442-2
- Royle, Edward (1974). Victorian Infidels: the origins of the British Secularist Movement, 1791–1866. Manchester: Manchester University Press. ISBN 0-7190-0557-4
- Royle, Edward (1980). Radicals, Secularists and Republicans: popular freethought in Britain, 1866–1915. Manchester: Manchester University Press. ISBN 0-7190-0783-6
- Tribe, David (1967). 100 Years of Freethought. London: Elek Books.
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