Who said "Hard work and sincerity are my only weapons."?

This quote is attributed to Luffy.

Hard work and sincerity are my only weapons. - Luffy

"Hard work and sincerity are my only weapons."

Luffy Work

"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."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."