Who said "War between friends is never worth it."?

This quote is attributed to Swiper.

War between friends is never worth it. - Swiper

"War between friends is never worth it."

Swiper War

"Swiper, no swiping!"

"Oh, man!"

"You'll never stop me, Dora!"

"I'm gonna swipe it!"

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."