“Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes.”
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John Dewey 62
American philosopher, psychologist, and educational reformer 1859–1952Related quotes

“You learn as much from failure as from success, Dad always says. Though no one admires you for it.”
Source: We Are All Completely Beside Ourselves

“I’ve had a lot of success; I’ve had failures, so I learn from the failure.”

“When I think about my career, my successes are built on learning from failures.”
Boy Genius Report: "When I think about my career, my successes are built on learning from failures: Microsoft CEO Satya Nadella" https://www.bgr.in/news/when-i-think-about-my-career-my-successes-are-built-on-learning-from-failures-microsoft-ceo-satya-nadella/ (29 December 2015)

As quoted in The Leadership Secrets of Colin Powell (2003) by Oren Harari, p. 164.
2000s
“Nothing fails like success because we don't learn from it. We learn only from failure.”
Kenneth Boulding (1971) "The diminishing returns of science" in: New Scientist. (March 25, 1971) Vol. 49, nr. 744. p. 682
1970s
Context: Perhaps the most difficult ethical problem of the scientific community arises not so much from conflict with other subcultures as from its own success. Nothing fails like success because we don't learn from it. We learn only from failure.

“But he who neither thinks for himself nor learns from others, is a failure as a man.”
Source: Works and Days and Theogony