Quote by River Song

"Spoilers!"

"I'm River Song. Check your records again."

"You can't change history. Well, that's what they always say. But they don't really mean it. You can change it, you just can't acknowledge that you've changed it."

"Hello, sweetie."

"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."