Who said "I believe we're stronger together than we are apart."?

This quote is attributed to Luigi.

I believe we're stronger together than we are apart. - Luigi

"I believe we're stronger together than we are apart."

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."