Who said "I have learned that the self is the greatest teacher."?

This quote is attributed to Siddhartha.

I have learned that the self is the greatest teacher. - Siddhartha

"I have learned that the self is the greatest teacher."

Siddhartha Knowledge

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."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."