The Impossible Planet (1) - S2-E11
Doctor: Pfft... I'd have to settle down. In a house or something, a proper house with... With... With... With doors and things. Carpets! Me! Living in a house! Now that... That is terrifying.
Rose: You'd have to get a mortgage.
Doctor: No.
Rose: Oh yes.
Doctor: I am dying. That's it. I am dying, it is all over.
The Impossible Planet (1) - S2-E11
Doctor: So, when it comes right down to it, why did you come here? Why did you do that? Why? I'll tell you why. Because it was there. Brilliant. Excuse me, ah, Zach, wasn't it?
Zach: That's me.
Doctor: Just stand there, 'cause I'm gonna hug you. Is that all right?
Zach: I s'pose so.
Doctor: Here we go. Coming in.
[He hugs Zach.]
Doctor: Ahh, human beings, you are amazing! Ha!
[He releases Zach.]
Doctor: Thank you.
Zach: Not at all.
Doctor: But apart from that, you're completely mad. You should pack your bags and get back in that ship and fly for your lives.
Chosen answer: The Master knows that deep down, he deserves death for the crimes that he's committed throughout his life, and since he regards The Doctor as his arch-foe, he expects it to be at his hands. The fact that The Doctor is still willing to forgive him for all of his crimes hurts him more deeply than death would.
Captain Defenestrator