Jean Meslier (15 June 1664 – 17 June 1729) was a French Catholic priest who was discovered, upon his death, to have written a book-length philosophical essay promoting atheism. Described by the author as his "testament" to his parishioners, the text denounces all religion.
Jean Meslier was born in Mazerny in the Ardennes. He began learning Latin from a neighborhood priest in 1678 and eventually joined the seminary; he later claimed, in the Author's Preface to his Testament, this was done to please his parents. At the end of his studies, he took Holy Orders and, on 7 January 1689, became priest at Étrépigny, in Champagne. One public disagreement with a local nobleman aside, Meslier was to all appearances generally unremarkable, and he performed his office without complaint or problem for 40 years. He lived like a pauper, and every penny left over was donated to the poor.
When Meslier died, there were found in his house three copies of a 633-page octavo manuscript in which the village curate denounces organized religion as "but a castle in the air" and theology as "but ignorance of natural causes reduced to a system".
In his Testament, Meslier repudiated not only the God of conventional Christianity, but even the generic God of the natural religion of the deists. For Meslier, the existence of evil was incompatible with the idea of a good and wise God. He denied that any spiritual value could be gained from suffering, and he used the deist's argument from design against god, by showing the evils that he had permitted in this world. To him, religions were fabrications fostered by ruling elites; although the earliest Christians had been exemplary in sharing their goods, Christianity had long since degenerated into encouraging the acceptance of suffering and submission to tyranny as practised by the kings of France: injustice was explained away as being the will of an all-wise Being. None of the arguments used by Meslier against the existence of God were original, in fact, he derived them from books written by orthodox theologians in the debate between the Jesuits, Cartesians, and Jansenists: their inability to agree on a proof for God's existence was taken by Meslier as a good reason not to presume that there were compelling grounds for belief in God.
Meslier's philosophy was that of an atheist. He also denied the existence of the soul and dismissed the notion of free will. In Chapter V, the priest writes, "If God is incomprehensible to man, it would seem rational never to think of Him at all"; Meslier does think of him, however, for several hundred pages more, in which he calls God "a chimera" and argues that the supposition of God is not prerequisite to morality. In fact, he concludes that "[w]hether there exists a God or not [...] men's moral duties will always be the same so long as they possess their own nature".
In his most famous quote, Meslier refers to a man who "...wished that all the great men in the world and all the nobility could be hanged, and strangled with the guts of the priests." Meslier admits that the statement may seem crude and shocking, but comments that this is what the priests and nobility deserve, not for reasons of revenge or hatred, but for love of justice and truth.
Meslier also vehemently attacked social injustice and sketched out a kind of rural proto-communism. All the people in a region would belong to a commune in which wealth would be held in common, and everybody would work. Founded on love and brotherhood, the communes would ally to help each other and preserve peace.
Voltaire's Extrait 
Various edited abstracts (known as "extraits") of the Testament were printed and circulated, condensing the multi-volume original manuscript and sometimes adding material that was not written by Meslier. Abstracts were popular because of the length and convoluted style of the original.
Voltaire often mentions Meslier (referring to him as "a good priest") in his correspondence, in which he tells his daughter to "read and read again" Meslier's only work, and says that "every honest man should have Meslier's Testament in his pocket." However, he also described Meslier as writing "in the style of a carriage-horse".
Voltaire published his own expurgated version as Extraits des sentiments de Jean Meslier (first edition, 1762). Voltaire's edition changed the thrust of Meslier's arguments (or drew on other Extraits which did this) so that he appeared to be a deist—like Voltaire—rather than an atheist.
The following passage is found at the end of Voltaire's Extrait, and has been cited in support of the view that Meslier was not really an atheist. However, the passage does not appear in either the 1864 complete edition of the Testament, published in Amsterdam by Rudolf Charles, or in the complete works of Meslier published 1970-1972.
I will finish by begging God, so outraged by that sect, to deign to recall us to natural religion, of which Christianity is the declared enemy. To that simple religion that God placed in the hearts of all men, which teaches us that we only do unto others what we want to have done unto us. Then the universe will be composed of good citizens, of just fathers, of submissive children, of tender friends. God gave us this religion in giving us reason. May fanaticism no longer pervert it! I die more filled with these wishes than with hopes. This is the exact summary of the in-folio testament of Jean Meslier. We can judge how weighty is the testimony of a dying priest who asks God's forgiveness.
The complete Testament of Meslier was published in English translation (by Michael Shreve) for the first time in 2009.
Meslier's significance 
In his book In Defense of Atheism the contemporary atheist philosopher Michel Onfray describes Meslier as the first person to write an entire text in support of atheism:
For the first time (but how long will it take us to acknowledge this?) in the history of ideas, a philosopher had dedicated a whole book to the question of atheism. He professed it, demonstrated it, arguing and quoting, sharing his reading and his reflections, and seeking confirmation from his own observations of the everyday world. His title sets it out clearly: Memoir of the Thoughts and Feelings of Jean Meslier; and so does his subtitle: Clear and Evident Demonstrations of the Vanity and Falsity of All the Religions of the World. The book appeared in 1729, after his death. Meslier had spent the greater part of his life working on it. The history of true atheism had begun.
Prior to announcing Meslier as the first atheist philosopher, Onfray considers and dismisses Cristóvão Ferreira, a Portuguese and former Jesuit who renounced his faith under Japanese torture in 1633 and went on to write a book titled The Deception Revealed. However, Onfray decides that Ferreira was not such a good candidate as Meslier, since Ferreira converted to Zen Buddhism.
According to Colin Brewer (2007), who co-produced a play about Meslier's life,
Historians argue about who was the first overt, post-Classical atheist but Meslier was arguably the first to put his name to an incontrovertibly atheist document. That this important event is largely unrecognised (Meslier was absent from both Richard Dawkins’ and Jonathan Miller's recent TV series on atheism) is due partly to Voltaire who published, in 1761, a grossly distorted "Extract" that portrayed Meslier as a fellow-deist and entirely suppressed Meslier's anti-monarchist, proto-communist opinions.
- See Morehouse (1936, p. 12) and Meslier (2009).
- 1864 introduction to Meslier's Testament
- Antognazza, Maria Rosa (2006). "Arguments for the existence of God: the continental European debate", pp. 734-735, in Haakonssen, Knud. The Cambridge History of Eighteenth-Century Philosophy, vol. 2. Cambridge University Press.
- Fonnesu, Luca (2006). "The problem of theodicy", pp. 766, in Haakonssen, Knud. The Cambridge History of Eighteenth-century Philosophy, vol. 2. Cambridge University Press.
- Peter Byrne, James Leslie Houlden (1995), Companion Encyclopedia of Theology, p. 259. Taylor & Francis.
- J. O. Lindsay, (1957), The New Cambridge Modern History, p. 86. Cambridge University Press.
- John Hedley Brooke (1991), Science and Religion: Some Historical Perspectives, p. 171. Cambridge University Press.
- Peter France, (1995), The new Oxford companion to literature in French, page 523. Oxford University Press
- Jean Meslier, Testament, ch. 2: «Il souhaitait que tous les grands de la Terre et que tous les nobles fussent pendus et étranglés avec les boyaux des prêtres.»
- George Huppert (1999), The style of Paris: Renaissance origins of the French Enlightenment, p. 108. Indiana University Press.
- Diderot, Dithrambe sur Féte des Rois: «Et des boyaux du dernier prêtre serrons le cou du dernier roi.»
- "Utopianism in the Renaissance and Enlightenment", in Donald F. Busky (2002), Communism in History and Theory, pp. 54-55. Greenwood.
- See Wade (1933) for a discussion of the different versions and Extraits of the manuscript of the Testament.
- See for example: McGrath, Alister (2004). The Twilight of Atheism (p. 24).
- Morehouse (1936, pp. 26-27); see also Wade (1933, p. 387, but especially p. 393-394).
- Deprun et al (1972).
- Baron d'Holbach - Good Sense
- Baron d'Holbach - Good Sense: Transcription Notes. "Holbach published Le Bon Sens anonymously in 1772. The book was mistakenly identified as the work of Jean Meslier (1664-1729), a Catholic priest who had renounced Christianity in a posthumously published Testament. As late as the 20th century English translations of Le Bon Sens were still being published under Meslier's name, often bearing such titles as Common Sense and Superstition in All Ages. Editions ascribed to Meslier frequently include an abstract of his Testament together with Voltaire's correspondence regarding Meslier."
- Testament: Memoir of the Thoughts and Sentiments of Jean Meslier. Prometheus Books, 2009. ISBN 1-59102-749-7.
- Michel Onfray, In Defence of Atheism, translation by Jeremy Leggatt, Arcade Publishing, 2007, p. 29.
- Brewer, Colin (2007). "Thinker: Jean Meslier", New Humanist. Vol. 122 (4), July/August. Available online: .
- Deprun, Jean; Desné, Roland; Soboul, Albert (1970). Jean Meslier. Oeuvres complètes. Vol.1. Paris: Editions Anthropos.
- Deprun, Jean; Desné, Roland; Soboul, Albert (1971). Jean Meslier. Oeuvres complètes. Vol.2. Paris: Editions Anthropos.
- Deprun, Jean; Desné, Roland; Soboul, Albert (1972). Jean Meslier. Oeuvres complètes. Vol.3. Paris: Editions Anthropos.
- Meslier, Jean (2009). Testament: Memoir of the Thoughts and Sentiments of Jean Meslier. Translated by Michael Shreve. Prometheus Books. ISBN 1-59102-749-7.
- Morehouse, Andrew R. (1936). Voltaire and Jean Meslier. Yale Romanic Studies, IX. New Haven: Yale University Press.
- Wade, Ira O. (1933). "The Manuscripts of Jean Meslier's "Testament" and Voltaire's Printed "Extrait" ", Modern Philology, Vol. 30 (4), May, pp. 381-398 .
- Le bon sens du curé J. Meslier, suivi de son testament published 1830 includes correspondence of Voltaire on Meslier's testament, a biography of Meslier by Voltaire, Le bon sens, by d'Holbach, and the Extrait of the Testament produced by Voltaire.
- 1864 complete edition Volume 1, Volume 2 and Volume 3
- A translation of Voltaire's abridged "Testament".
- Jean Meslier and "The Gentle Inclination of Nature" by Michel Onfray translated by Marvin Mandell