Spock Prime: Mr Spock.
Spock: I will be brief. In your travels, did you ever encounter a man named Khan?
Spock Prime: As you know, I have made a vow never to give you information that could potentially alter your destiny. Your path is yours to walk, and yours alone. That being said, Khan Noonien Singh is the most dangerous adversary the Enterprise ever faced. He is brilliant, ruthless and he will not hesitate to kill every single one of you.
Spock: Did you defeat him?
Spock Prime: At great cost, yes.