“Happiness is surely the best teacher of good manners: only the unhappy are churlish in deportment.”
Where the Blue Begins (1922)
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Christopher Morley 30
American journalist, novelist, essayist and poet 1890–1957Related quotes

“Whether happy or unhappy, life is the only treasure man possesses”
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The Story of My Life (trans. Sartarelli/Hawkes 2001), Preface, p. 10
Referenced
Variant: [H]appy or miserable, life is the only blessing which man possesses[. ]

“Man is unhappy because he doesn't know he's happy. It's only that.”
Part II, Ch. I
The Possessed (1872)

Statement made to a correspondent in Paris in 1976 — reported in John Callcott, United Press International (December 21, 1982) "Arthur Rubinstein, At Age 95; Concert Pianist and Bon Vivant, Boston Globe.
Attributed

A New Slant on Life (1998).

“Accomplish more only in the best manner and not by taking away from the needy.”