Who said "The greatest adventures are those within ourselves."?

This quote is attributed to Don Quixote.

The greatest adventures are those within ourselves. - Don Quixote

"The greatest adventures are those within ourselves."

Don Quixote Adventure

Character in Don Quixote

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"The Knight of the Sorrowful Countenance"

"I know who I am, and who I may be, if I choose."

"Facts are the enemy of truth."

"The pen is mightier than the sword."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."