Inevitable

KIRK: You're a man of integrity in both universes, Mister Spock.

MIRROR SPOCK: You must return to your universe. I must have my captain back. I shall operate the transporter. You have two minutes and ten seconds.

KIRK: In that time I have something to say. How long before the Halkan prediction of galactic revolt is realised?

MIRROR SPOCK: Approximately two hundred and forty years.

KIRK: The inevitable outcome?

MIRROR SPOCK: The Empire shall be overthrown, of course.

KIRK: The illogic of waste, Mister Spock. The waste of lives, potential, resources, time. I submit to you that your Empire is illogical because it cannot endure. I submit that you are illogical to be a willing part of it.

MIRROR SPOCK: You have one minute and twenty three seconds.

KIRK: If change is inevitable, predictable, beneficial, doesn't logic demand that you be a part of it?

MIRROR SPOCK: One man cannot summon the future.

KIRK: But one man can change the present. Be the captain of this Enterprise, Mister Spock. Find a logical reason for sparing the Halkans and make it stick. Push till it gives.

-Star Trek (The Original Series),

Episode: "Mirror Mirror"