„No one is completely unhappy at the failure of his best friend.“

— Groucho Marx

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„A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying.“
— B.F. Skinner
„The season of failure is the best time for sowing the seeds of success.“
— Paramahansa Yogananda
„Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes.“
— John Dewey