“Success, after all, loves a witness, but failure can't exist without one.”
Source: The Brief Wondrous Life of Oscar Wao
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Junot Díaz 75
Dominican-American writer 1968Related quotes

“There's no success like failure, and failure's no success at all.”
Song lyrics, Bringing It All Back Home (1965), Love Minus Zero/No Limit

“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

The Analects, The Doctrine of the Mean
Context: In all things success depends on previous preparation, and without such previous preparation there is sure to be failure. If what is to be spoken be previously determined, there will be no stumbling. If affairs be previously determined, there will be no difficulty with them. If one's actions have been previously determined, there will be no sorrow in connection with them. If principles of conduct have been previously determined, the practice of them will be inexhaustible.

“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

“Love can exist without respect, but you can't expect it to last longer.”

Fast Company interview (2011)