You're right - I had mis-remembered it. The scene I was thinking of was the one near the end of Wrath of Khan where Spock and Kirk are discussing sacrifice, but

You're right - I had mis-remembered it. The scene I was thinking of was the one near the end of Wrath of Khan where Spock and Kirk are discussing sacrifice, but that's not where the quote is from. I'll blame it on the scene in II being so much more memorable. ;)