Star Trek: Deep Space Nine, Season 4

[O'Brien is preparing to commit suicide]

Julian Bashir:
Chief?

Miles O'Brien:
Get outta here, Julian.

Julian Bashir:
You don't want to do this, Chief.

Miles O'Brien:
The hell I don't.

Julian Bashir:
Look, I don't claim to know what you're going through, but whatever it is, it's not worth dying for.

Miles O'Brien:
You don't understand at all. I'm not doing this for me. I'm doing it to protect Keiko and Molly and everyone else on this station.

Julian Bashir:
Protect us from what?

Miles O'Brien:
From me. I'm not the man I used to be. I'm dangerous. I nearly hit Molly today. All she wanted was a little attention, and I nearly hit her.

Julian Bashir:
But you didn't. You're a good man, Miles Edward O'Brien, and whatever it is you think you've done wrong, you don't deserve to die.