Star Trek: The Original Series, Season 3

[The Enterprise is hailed by the Melkotians]

Melkotian:
Captain Kirk. You did not kill. Is this the way of your kind?

Kirk:
We fight only when there is no other choice. We prefer the ways of peaceful contact. I speak for a vast alliance of fellow creatures who believe in the same thing. We have sought you out to join us. Our mission is still one of peace.

Melkotian:
Approach our planet and be welcome. A delegation will come out to meet you. Our warning threats are over.

Kirk:
Excellent. Lieutenant, cancel Red Alert. Mister Chekov, resume original course, warp factor two.

Chekov:
Warp factor two, sir.

Spock:
Captain. May I ask a question? You needn't answer if it seems too personal.

Kirk:
I'm sure I'll be able to give you an answer, Mister Spock

Spock:
This afternoon, you wanted to kill, didn't you?

McCoy:
But he didn't kill, Mister Spock.

Spock:
But he wanted to, Doctor.

Kirk:
Is that the way it seemed to you?

Spock:
Yes, sir.

Kirk:
Mister Spock... you're absolutely right. That's exactly the way it was.

Spock:
Mankind. Ready to kill.

Kirk:
That's the way it was in 1881.

Spock:
I wonder how humanity managed to survive.

Kirk:
... We overcame our instinct for violence.