Who said "I'm going to do my best."?

This quote is attributed to Mario.

I'm going to do my best. - Mario

"I'm going to do my best."

Mario Work

"It's-a me, Mario!"

"Let's-a-go!"

"Mamma mia!"

"I'm not giving up on my brother."

"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."