Who said "I sought the secret of myself."?

This quote is attributed to Siddhartha.

I sought the secret of myself. - Siddhartha

"I sought the secret of myself."

Siddhartha

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."