“Flaming enthusiasm, backed up by horse sense and persistence, is the quality that most frequently makes for success.”
As quoted in A Joke, a Quote, & the Word : Feed Your Body, Soul and Spirit (2006) by Ronald P. Keeven, p. 147
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Dale Carnegie 98
American writer and lecturer 1888–1955Related quotes

Address to the Annual Dinner of the Canadian Press, Toronto, April 18, 1956
Speaking Of Canada - (1959)

“Enthusiasm makes up for a host of deficiencies.”
“Not a visible enthusiasm but a hidden one, an excitement burning with a cold flame.”
Source: Perfume: The Story of a Murderer

Lectures on the English Poets http://www.gutenberg.org/files/16209/16209.txt (1818), Lecture I, "On Poetry in General"
Julius Sumner Miller, in What Science Teaching Needs, Junior college journal, volume 38 (1967), by American Association of Junior Colleges, Stanford University.
Context: My view is this: We teach nothing. We do not teach physics nor do we teach students. (I take physics merely as an example.) What is the same thing: No one is taught anything! Here lies the folly of this business. We try to teach somebody nothing. This is a sorry endeavour for no one can be taught a thing.
What we do, if we are successful, is to stir interest in the matter at hand, awaken enthusiasm for it, arouse a curiosity, kindle a feeling, fire up the imagination. To my own teachers who handled me in this way, I owe a great and lasting debt.
“Look for every seed of enthusiasm, and try to build pockets of success.”
Source: Imaginization (1993), p. 47

“Failure is a frequent stop on the road to success.”
Future Proofing You (2021)

“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