DOCTOR: Hello, I'm-

TOSHKA: A demon from hell!

DOCTOR: Close enough.

DOCTOR: Charley, C'Rizz, Lucie, Tamsin, Molly. Friends, companions I've known, I salute you. And Cass, I apologise. Physician, heal thyself.

DOCTOR: Every great decision creates ripples, like a huge boulder dropped in a lake. The ripples merge and rebound off the banks in unforeseeable ways. The heavier the decision, the larger the waves, the more uncertain the consequences.

VALEYARD: There's nothing you can do to prevent the catharsis of spurious morality.