Mark Twain book Roughing It
Chapter XLVIII, p. 344 https://babel.hathitrust.org/cgi/pt?id=coo1.ark:/13960/t0xp7k74t&view=1up&seq=364' (published 1872) <br class="br">Roughing It (1872)
Discover the wit and wisdom of Mark Twain, America's beloved author. From inspiring success to clever human insights, our quotes capture Twain's humor and brilliance, inspiring and entertaining you.
Mark Twain, born Samuel Langhorne Clemens, was an acclaimed American writer and humorist. He is known as the "greatest humorist the United States has produced" and was hailed by William Faulkner as the "father of American literature". Twain's notable works include The Adventures of Tom Sawyer, Adventures of Huckleberry Finn, A Connecticut Yankee in King Arthur's Court, and Pudd'nhead Wilson. Additionally, he co-wrote The Gilded Age: A Tale of Today with Charles Dudley Warner.
Raised in Hannibal, Missouri, Twain drew inspiration from his hometown for his famous novels. Before finding success as an author, he worked as a printer and typesetter and contributed articles to his brother's newspaper. Twain later became a renowned riverboat pilot on the Mississippi River before venturing west to join his brother in Nevada. His early journalism career included writing for the Virginia City Territorial Enterprise. It was there that he gained international recognition with his humorous story "The Celebrated Jumping Frog of Calaveras County". Known for his wit and satire, Twain garnered praise from critics and influential figures alike. Despite facing financial difficulties due to unsuccessful investments, including one in a mechanical typesetter called Paige Compositor, Twain eventually paid off all his debts. Interestingly, he predicted that he would die when Halley's Comet returned; true to his words, he passed away a day after the comet's closest approach to Earth.

Mark Twain book Roughing It
Chapter XLVIII, p. 344 https://babel.hathitrust.org/cgi/pt?id=coo1.ark:/13960/t0xp7k74t&view=1up&seq=364' (published 1872) <br class="br">Roughing It (1872)
Source: Autobiography of Mark Twain, Volume 1 (2010), p. 210
Mark Twain book Letters from the Earth
Letters from the Earth (1909)
Mark Twain book Letters from the Earth
Letters from the Earth (1909)
Mark Twain book Following the Equator
Ch. XXXVIII http://www.gutenberg.org/files/5811/5811-h/5811-h.htm <br class="br">Following the Equator (1897)
Mark Twain book Following the Equator
Ch. LVII http://www.gutenberg.org/files/2895/2895-h/p6.htm <br class="br">Following the Equator (1897)
Said to portrait painter Samuel Johnson Woolf, cited in Here am I (1941), Samuel Johnson Woolf; this has often been abbreviated: Most writers regard truth as their most valuable possession, and therefore are most economical in its use.
"The Chronicle of Young Satan" (ca. 1897–1900, unfinished), published posthumously in Mark Twain's Mysterious Stranger Manuscripts (1969), ed. William Merriam Gibson ( pp. 165–166 http://books.google.com/books?id=LDvA2xcYZKcC&pg=PA165 in the 2005 paperback printing, ISBN 0520246950)
Mark Twain book Adventures of Huckleberry Finn
Source: Adventures of Huckleberry Finn (1885), Ch. 16
“Go to heaven for the climate, hell for the company.”
https://quoteinvestigator.com/2011/07/19/heaven-for-climate/
“The ancients stole all our great ideas.”
Attested at least in 1780 https://books.google.ru/books?id=nUpWAAAAYAAJ&q=Ancients&pg=PA32 (by John Hope):<br><br>Now, the Devil confound those Ancients, for they have stolen all my good thoughts from me! <br class="br">Misattributed
It is the choicest compliment that has ever been paid us, and the most gratifying to our feelings. It is simple, direct, gracefully phrased: it always sounds well — In God We Trust. I don't believe it would sound any better if it were true. And in a measure it is true — half the nation trusts in Him. That half has decided it.
Source: Mark Twain's Notebook (1935), p. 394
“The only reason why God created man is because he was disappointed with the monkey.”
Autobiographical Dictation (1906)
“Don't believe the world owes you a living. The world owes you nothing. It was here first.”
Misattributed <br class="br">Source: Often attributed to Twain, but sourced to Robert J. Burdette, Quote Investigator http://quoteinvestigator.com/2014/06/06/world-owes/
Source: Autobiographical dictation, 2 December 1906. Published in Autobiography of Mark Twain, Volume 2 (University of California Press, 2013)
Mark Twain book Concerning the Jews
Concerning the Jews (Harper's Magazine, Sept. 1899)