At fifteen my mind was set on learning. At thirty my character had been formed. At forty I had no more perplexities. At fifty I knew the Mandate of Heaven. At sixty I was at ease with whatever I heard. At seventy I could follow my heart's desire without transgressing moral principles.

Confucius

Quoted in Analects

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Citation

Kongzi [Confucius]. The Analects. 3rd century BC, 2:4.