“Humor and pathos, tears and laughter are, in the highest expression of human character and achievement, inseparable.”
"The Case for Comedy", Lanterns & Lances http://books.google.com/books?id=m0RZAAAAYAAJ&q=%22humor+and+pathos+tears+and+laughter+are+in+the+highest+expression+of+human+character+and+achievement+inseparable%22&pg=PA143#v=onepage (1961); previously appeared in The Atlantic Monthly November 1960 http://books.google.com/books?id=6q8GAQAAIAAJ&q=%22and+pathos+tears+and+laughter+are+in+the+highest+expression+of+human+character+and+achievement+inseparable%22&pg=PA98#v=onepage
From Lanterns and Lances
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James Thurber 90
American cartoonist, author, journalist, playwright 1894–1961Related quotes

“The analysis of character is the highest human entertainment.”
The New York Times (26 November 1978)

“The source of all humor is not laughter, but sorrow.”
Variant: The secret source of humor is not joy but sorrow; there is no humor in heaven.

Source: Year unknown, published in 2004, How to Be Like Walt : Capturing the Magic Every Day of Your Life (2004), Ch. 1 : It All Started with a Boy, p. 16

Source: Mathematics and Humor: A Study of the Logic of Humor (1980), Chapter 3, “Self-Reference and Paradox” (p. 50)

Originally published in "Encyclopedia Tropicana: A Reference Book for the Modern World, Volume 1" by Joel Achenbach, The Miami Herald, May 4, 1986; quoted by Bryan Curtis, " Dave Barry: Elegy for the humorist http://slate.msn.com/id/2112218," Slate, January 12, 2005
Columns and articles
“There is a thin line that separates laughter and pain, comedy and tragedy, humor and hurt.”

“The eye of genius has always a plaintive expression, and its natural language is pathos.”
1840s, Letters from New York (1843)
Source: Letters from New York http://www.bartleby.com/66/62/12262.html, vol. 1, letter 39