“Spring work is going on with joyful enthusiasm.”
Source: The Wilderness World of John Muir
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John Muir 183
Scottish-born American naturalist and author 1838–1914Related quotes
To the Cuckoo, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“My heart was light and joyful in my work, because the decisions were not mine.”
At his trial, as quoted by Alan Rosenthal, "Eichmann, Revisited" in The Jerusalem Post (20 April 2011) http://m.jpost.com/Jerusalem-Report/Jewish-World/Eichmann-Revisited.

As quoted in "Credo from Tomlin: Let's have fun" by Ed Bouchette, in The Pittsburgh Post-Gazette (27 January 2009) http://www.post-gazette.com/pg/09027/944772-66.stm

Speaking during the 1971 World Series, as quoted in The Chicago Tribune by Bob Markus, reprinted in I'll Play These: From Ecstacy to Angst, A Sports Writer’s Journey https://books.google.com/books?id=sdzKAmeIoE8C&pg=PA219 (2011), p. 219
Baseball-related, <big><big>1970s</big></big>, <big>1971</big>

“Courage is going from failure to failure without losing enthusiasm.”

“Success consists of going from failure to failure without loss of enthusiasm”
Attribution debunked in Langworth's Churchill by Himself. The earliest close match located by the Quote Investigator is from the 1953 book How to Say a Few Words by David Guy Powers.
Misattributed
Variant: Success is the ability to go from one failure to another with no loss of enthusiasm.
Source: 1953, How to Say a Few Words by David Guy Powers, Quote p. 109, Doubleday & Company, Garden City, New York. Referenced by Quote Investigator http://quoteinvestigator.com/2014/06/28/success
poem before 1973; in a exh. cat., ed. Suzanne Delehanty (1973; repr., Philadelphia: The Falcon Press, 1976), p. 40
1970's

“Success is the ability to go from failure to failure without losing your enthusiasm.”
No definite source has been found for this statement; though most often attributed to Sir Winston Churchill, and sometimes to Abraham Lincoln, it has only rarely been attributed to Campbell.
Disputed