„It is well known that a vital ingredient of success is not knowing that what you’re attempting can’t be done. A person ignorant of the possibility of failure can be a half-brick in the path of the bicycle of history.“

— Terry Pratchett

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„… it is well known that a vital ingredient of success is not knowing that what you're attempting can't be done.“
— Terry Pratchett
„Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes.“
— John Dewey
„the most important single ingredient in the formula of success is knowing how to get along with people.“
— Theodore Roosevelt