“the 10,000hr rule is a definite key in success”
Source: Outliers: The Story of Success
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Malcolm Gladwell 70
journalist and science writer 1963Related quotes

Variant: Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
Source: https://www.google.com/books/edition/What_Is_E_Commerce/PkPhDwAAQBAJ

“The key to success is failure”

“I don't know the key to success, but the key to failure is trying to please everybody.”
Originally from Herbert Bayard Swope (1882-1958); often attributed to Cosby, he actually cites this as a sound advice he once read elsewhere, in "Dr. Bill Cosby" in Ebony, Vol. 32, No. 8 (June 1977), p. 136
Misattributed

“Action is the foundational key to all success.”

“Action is the foundational key to all success.”
As quoted in Stack the Logs! : Building a Success Framework to Reach Your Dreams (2003) by Frank F. Lunn, p. 45

“Unselfishness is the key to success in higher life.”
Living Hinduism ( Page 151 )