Who said "To teach is to learn twice over."?

This quote is attributed to Siddhartha.

To teach is to learn twice over. - Siddhartha

"To teach is to learn twice over."

Siddhartha Education

Character in Siddhartha

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"It is not for me to judge another man's life."

"I have learned through yearning."

"Every man must find his own path."

"I sought to reach Nirvana, to die, to stop suffering."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."