The Walking Dead Season 1 Episode 6

Dr. Jenner: You do want this. Last night you said you knew it was just a matter of time before everybody you loved was dead.
Shane: What? You really said that? After all your big talk?
Rick: I had to keep hope alive, didn't I?
Dr. Jenner: There is no hope. There never was.
Rick: There's always hope. Maybe it won't you, maybe not be here. But somebody somewhere...
Andrea: What part of "everything is gone" do you not understand?
Dr. Jenner: Listen to your friend. She gets it. This is what takes us down. This is our extinction event.
Carol: This isn't right. You can't just keep us here.
Dr. Jenner: One tiny moment -- a millisecond. No pain.
Carol: My daughter doesn't deserve to die.
Dr. Jenner: Wouldn't it be kinder, to be more compassionate to just hold your loved ones and wait for the clock to run down?