Who said "A promise is the symbol of a man's will."?

This quote is attributed to Zoro.

A promise is the symbol of a man's will. - Zoro

"A promise is the symbol of a man's will."

Zoro Truth

"I am not going to die. I'm going to keep fighting until I become the world's greatest swordsman!"

"Shitty glasses."

"I don't care what the world thinks. I'm going to be the world's greatest swordsman!"

"A swordsman's true path is one of solitude."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."