Who said "You must have felt great pain to make such a face."?

This quote is attributed to Luffy.

You must have felt great pain to make such a face. - Luffy

"You must have felt great pain to make such a face."

Luffy Kindness

"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."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."