“Spring work is going on with joyful enthusiasm.”

To the Cuckoo, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

quoting F. W. Sanderson, "The Joy of Living Dangerously: Sanderson of Oundle"
A Devil's Chaplain (2003)

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&#x27;ll Play These: From Ecstacy to Angst, A Sports Writer’s Journey https://books.google.com/books?id=sdzKAmeIoE8C&amp;pg=PA219 (2011), p. 219 <br class="br">Baseball-related, &lt;big&gt;&lt;big&gt;1970s&lt;/big&gt;&lt;/big&gt;, &lt;big&gt;1971&lt;/big&gt;

Attribution debunked in Langworth&#x27;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. <br class="br">Misattributed <br class="br">Variant: Success is the ability to go from one failure to another with no loss of enthusiasm. <br class="br">Source: 1953, How to Say a Few Words by David Guy Powers, Quote p. 109, Doubleday &amp; 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

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