The portion after the second semicolon is widely paraphrased or misquoted. Two examples are "For every complex problem there is an answer that is clear, simple, and wrong" and "There is always an easy solution to every human problem -- neat, plausible, and wrong."
1910s
Source: "The Divine Afflatus" in New York Evening Mail (16 November 1917); later published in Prejudices: Second Series (1920) and A Mencken Chrestomathy (1949)
“At the time the book of Marquis de l'Hôpital had appeared, and almost all mathematicians began to turn to the new geometry of the infinite [that is, the new infinitesimal calculus], until then little known. The surprising universality of the methods, the elegant brevity of the proofs, the neatness and speed of the most difficult solutions, a singular and unexpected novelty, all attracted the mind and there was in the mathematical world a well marked revolution [une révolution bien marquée.”
1792) as quoted by I. Bernard Cohen, Revolution in Science (1985
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Bernard Le Bovier de Fontenelle 13
French writer, satirist and philosopher of enlightenment 1657–1757Related quotes
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
1970s, How do we tell truths that might hurt? (1975)
As quoted in The Century: A Popular Quarterly (1874) ed. Richard Watson Gilder, Vol. 7, pp. 508-509, https://books.google.com/books?id=ceYGAQAAIAAJ&pg=PA508 "Relations of Mathematics to Physics". Earlier quote without citation in Nature, Volume 8 (1873), page 450.
Also quoted partially in Michael Grossman and Robert Katz, Calculus http://babel.hathitrust.org/cgi/mb?a=listis;c=216746186|Non-Newtonian (1972) p. iv. ISBN 0912938013.
On the deterioration of her marriage to Kenneth Tynan, as quoted in her obituary in The Telegraph (6 May 2008) http://www.telegraph.co.uk/news/obituaries/1933071/Elaine-Dundy.html?source=rss
“Novelty, the most potent of all attractions, is also the most perishable.”
Un Art de Vivre (The Art of Living) (1939), The Art of Loving
“All men are almost led to believe not of proof, but by attraction.”
The Art of Persuasion
Context: All men are almost led to believe not of proof, but by attraction. This way is base, ignoble, and irrelevant; every one therefore disavows it. Each one professes to believe and even to love nothing but what he knows to be worthy of belief and love.