Who said "Kill or be killed. That's the only truth I know."?

This quote is attributed to Nebula.

Kill or be killed. That's the only truth I know. - Nebula

"Kill or be killed. That's the only truth I know."

Nebula War

"I didn't ask for this life."

"You're welcome."

"I will kill you slowly."

"Gamora may have stolen your money, but I will steal your life."

"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."