Who said "You cannot defeat someone who has already defeated you."?

This quote is attributed to Kang.

You cannot defeat someone who has already defeated you. - Kang

"You cannot defeat someone who has already defeated you."

Kang War

"I have seen the future, and it is terrible. Unless we act now."

"You cannot escape your destiny. I have already won."

"Time is a river, and I have learned to swim upstream."

"All timelines collapse into one. Mine."

"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."