Who said "The adventure is just beginning!"?

This quote is attributed to Luffy.

The adventure is just beginning! - Luffy

"The adventure is just beginning!"

Luffy Adventure

"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."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."