Who said "The only true failure is not trying."?

This quote is attributed to Don Quixote.

The only true failure is not trying. - Don Quixote

"The only true failure is not trying."

Don Quixote Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."