Who said "I'm scared, but that's exactly why I have to go."?

This quote is attributed to Luigi.

I'm scared, but that's exactly why I have to go. - Luigi

"I'm scared, but that's exactly why I have to go."

Luigi Fear

"It's-a me, Luigi!"

"Mamma mia!"

"Let's-a-go!"

"I'm-a scared, but I'm-a going anyway!"

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."