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.
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Ch. LVII http://www.gutenberg.org/files/2895/2895-h/p6.htm
Following the Equator (1897)
Ch. XXXVIII http://www.gutenberg.org/files/5811/5811-h/5811-h.htm
Following the Equator (1897)
Letters from the Earth (1909)
Letters from the Earth (1909)
Source: Autobiography of Mark Twain, Volume 1 (2010), p. 210
Chapter XLVIII, p. 344 https://babel.hathitrust.org/cgi/pt?id=coo1.ark:/13960/t0xp7k74t&view=1up&seq=364' (published 1872)
Roughing It (1872)
Source: Autobiography of Mark Twain, Vol. 3 (2015), p. 435
originally in The Chronicle of Satan (1905).
The Mysterious Stranger (1916)
upon being told he had a good head for business, p. 378
Autobiography of Mark Twain, Volume 1 (2010)
“There are three kinds of lies: lies, damned lies, and statistics.”
Often attributed to Twain, but he said it was attributed to Benjamin Disraeli and this itself is probably a misattribution: see Lies, damned lies, and statistics and Leonard H. Courtney. Twain did, however, popularize this saying in the United States. His attribution is in the following passage from Twain's Autobiography (1924), Vol. I, p. 246 (apparently written in Florence in 1904) http://www.york.ac.uk/depts/maths/histstat/lies.htm:
Figures often beguile me, particularly when I have the arranging of them myself; in which case the remark attributed to Disraeli would often apply with justice and force: "There are three kinds of lies: lies, damned lies, and statistics".
Misattributed
“The funniest things are the forbidden.”
"Notebook 18 (February–September 1879)" in Mark Twain's Notebooks & Journals, Vol. 2 (1975), ed. Frederick Anderson, ISBN 0520025423, p. 304
Vol. I, p. 2
Mark Twain's Autobiography (1924)
“No accident ever comes late; it always arrives precisely on time.”
Source: Autobiography of Mark Twain, Vol. 2 (2013), p. 239
“He had only one vanity; he thought he could give advice better than any other person.”
"The Man That Corrupted Hadleyburg", ch. I, in The Man That Corrupted Hadleyburg and Other Stories and Essays (1900)
Source: Autobiography of Mark Twain, Volume 1 (2010), p. 120