“One of the greatest discoveries a person makes, one of their great surprises, is to find they can do what they were afraid they couldn't do.”
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Henry Ford 80
American industrialist 1863–1947Related quotes

As quoted in Steve Jobs at 44, Time (Michael Krantz and Steve Jobs, Oct. 10, 1999) http://content.time.com/time/printout/0,8816,32207,00.html
1990s

“One of the advantages of being disorganized is that one is always having surprising discoveries.”

“Life is a great surprise. I do not see why death should not be an even greater one.”

Interview, live at Coachella http://www.youtube.com/watch?v=8YMwcXBePqE

Source: The Expanse, Tiamat's Wrath (2019), Chapter 21 (p. 215)

Source: Self-Help; with Illustrations of Character and Conduct (1859), Ch. XI : Self-Culture — Facilities and Difficulties.
Source: The Lives Of George And Robert Stephenson
Context: We learn wisdom from failure much more than from success. We often discover what will do, by finding out what will not do; and probably he who never made a mistake never made a discovery.