A proverb meaning that failure is the foundation for success; failures teach lessons that lead to future success.
新しい企画がうまくいかなくても、失敗は成功のもとだと考えよう。
Even if the new project doesn't go well, let's think of failure as a stepping-stone to success.
彼は何度も挑戦している。『失敗は成功のもと』という言葉を信じているようだ。
He has tried many times. He seems to believe the saying 'failure is the mother of success.'
教師は生徒に向かって『失敗は成功のもとだから、臆せず挑戦しなさい』と言った。
The teacher told the students, 'Failure leads to success, so don't be afraid to try.'