According to The Quote Investigator http://quoteinvestigator.com/2014/04/17/butterfly/, "the earliest instance of this saying was crafted by the enigmatic “L” for “The Daily Crescent” newspaper in New Orleans [in June 1848]. ... The linkage to Henry David Thoreau is unsupported."
Misattributed
“Happiness is like a butterfly which, when pursued, is always beyond our grasp, but, if you will sit down quietly, may alight upon you.”
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Nathaniel Hawthorne 128
American novelist and short story writer (1804 – 1879) 1804–1864Related quotes
"The Artist of the Beautiful" (1844)
“I feel happy — deep down. May you be happy too.”
Journal entry (14 October 1922), published in The Journal of Katherine Mansfield (1927); these are the final words of the journal
Context: This all sounds very strenuous and serious. But now that I have wrestled with it, it's no longer so. I feel happy — deep down. May you be happy too. I'm going to Fontainebleau on Monday and I'll be back here Tuesday night or Wednesday morning. All is well.
Variant: Mr.Churchill, to what do you attribute your success in life? Conservation of energy. Never stand up when you can sit down. And never sit down when you can lie down.