Who said "Never give up, even when it's hard."?

This quote is attributed to Luigi.

Never give up, even when it's hard. - Luigi

"Never give up, even when it's hard."

Luigi Perseverance

"It's-a me, Luigi!"

"Mamma mia!"

"Let's-a-go!"

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

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."