Who said "War is the failure of everything else we've tried."?

This quote is attributed to Natasha Romanoff.

War is the failure of everything else we've tried. - Natasha Romanoff

"War is the failure of everything else we've tried."

Natasha Romanoff War

"I'm not going to fight you."

"Sometimes the best way to solve your own problems is to help someone else."

"I have a very specific skill set."

"You know, I'm actually a very good liar."

"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."