Letter to George Bainton, 15 October 1888, solicited for and printed in George Bainton, The Art of Authorship: Literary Reminiscences, Methods of Work, and Advice to Young Beginners (1890), pp. 87–88 http://books.google.com/books?id=XjBjzRN71_IC&pg=PA87.
Twain repeated the lightning bug/lightning comparison in several contexts, and credited Josh Billings for the idea:
Josh Billings defined the difference between humor and wit as that between the lightning bug and the lightning.
Speech at the 145th annual dinner of St. Andrew's Society, New York, 30 November 1901, Mark Twain Speaking (1976), ed. Paul Fatout, p. 424
Billings' original wording was characteristically affected:
Don't mistake vivacity for wit, thare iz about az mutch difference az thare iz between lightning and a lightning bug.
Josh Billings' Old Farmer's Allminax, "January 1871" http://books.google.com/books?id=sUI1AAAAMAAJ&pg=PT30. Also in Everybody's Friend, or; Josh Billing's Encyclopedia and Proverbial Philosophy of Wit and Humor (1874), p. 304 http://books.google.com/books?id=7rA8AAAAYAAJ&pg=PA304
Source: The Wit and Wisdom of Mark Twain
“Don't mistake vivacity for wit, thare iz about az mutch difference az thare iz between lightning and a lightning bug.”
Josh Billings' Old Farmer's Allminax, "January 1871" http://books.google.com/books?id=sUI1AAAAMAAJ&q=%22Don't+mistake+vivacity+for+wit+thare+iz+about+az+mutch+difference+az+thare+iz+between+lightning+and+a+lightning+bug%22&pg=PT30#v=onepage (1870)
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Josh Billings 91
American humorist 1818–1885Related quotes
“Politeness iz often wasted, but it iz a good and cheap mistake tew make.”
Josh Billings: His Works, Complete (1873)
“If the thunder don't get ya then the lightning will.”
“Sometimes you don't need lightning to start a fire. Sometimes, it builds on its own.”
Source: Ten Things We Did
“and love was lightning and remembrance”
Source: The Roominghouse Madrigals: Early Selected Poems, 1946-1966
“Oh, talk about lightning striking twice. Another goal scrubbed out for the United States.”
United States v. Algeria http://www.listenonrepeat.com/watch/?v=DALDkkXodRU (23 June 2010).
2010s, 2010, 2010 FIFA World Cup
“With lightning, you went from me, and I could find
Nothing to make a song about”
Reconciliation http://poetry.poetryx.com/poems/1568/
The Green Helmet and Other Poems (1910)
Context: Some may have blamed you that you took away
The verses that could move them on the day
When, the ears being deafened, the sight of the eyes blind
With lightning, you went from me, and I could find
Nothing to make a song about but kings,
Helmets, and swords, and half-forgotten things
That were like memories of you--but now
We'll out, for the world lives as long ago;
And while we're in our laughing, weeping fit,
Hurl helmets, crowns, and swords into the pit.
But, dear, cling close to me; since you were gone,
My barren thoughts have chilled me to the bone.