Who said "A true warrior never lets his guard down."?

This quote is attributed to Zoro.

A true warrior never lets his guard down. - Zoro

"A true warrior never lets his guard down."

Zoro

"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."