Who said "The greatest treasure isn't gold, it's friendship."?

This quote is attributed to Luigi.

The greatest treasure isn't gold, it's friendship. - Luigi

"The greatest treasure isn't gold, it's friendship."

Luigi Friendship

"It's-a me, Luigi!"

"Mamma mia!"

"Let's-a-go!"

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

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."