“There is a thin line that separates laughter and pain, comedy and tragedy, humor and hurt.”
“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.
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Mark Twain 637
American author and humorist 1835–1910Related quotes

Time and Individuality (1940)

"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
“Good humor and laughter are far too wonderful not to come straight from the heart of God.”
Smoke on the Mountain: An Interpretation of the Ten Commandment

“Joy and Sorrow have as source the very soul who planned their course.”
Rewards of Passion (Sheer Poetry) (1981)

Don Soderquist “ Live Learn Lead to Make a Difference https://books.google.com/books?id=s0q7mZf9oDkC&lpg=pg=PP1&dq=Don%20Soderquist&pg=PP1#v=onepage&q&f=false, Thomas Nelson, April 2006 p. 44.
On Keeping a Sense of Humor