"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
                                    
“The analysis of character is the highest human entertainment.”
The New York Times (26 November 1978)
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Isaac Bashevis Singer 39
Polish-born Jewish-American author 1902–1991Related quotes
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The Historian's Craft, pg.151
Source: The Anatomy of Human Destructiveness (1973), p. 264
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Kurt Hahn website http://www.kurthahn.org/quotes/quote1.html.
                                        
                                        Vol. 3, Ch. XV, The Americans 
Essays: Scientific, Political, and Speculative (1891)