Who said "The mark of a true pirate is never backing down."?

This quote is attributed to Luffy.

The mark of a true pirate is never backing down. - Luffy

"The mark of a true pirate is never backing down."

Luffy Courage

"I'm gonna be King of the Pirates!"

"A man's dream will never die!"

"I don't care what happens to me, I'm gonna help my friend!"

"Being alone is better than being with the wrong people."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."