In some ways, persistence is paramount.
Nothing in the world can take the place of Persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan 'Press On' has solved and always will solve the problems of the human race.
30th president of US (1872 - 1933)
The competing thought is Seth Godin's "The Dip", get out quickly and do something you're better at (aka, "Fail often, fail forward"). I quite like that too.
But if you're wondering about the mechanism of pushing through the pain barrier to eventual success, you could do way worse than:
"If You’re Not Good Enough, Just Do This One Thing Over and Over and Over… and Over Again."
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