DOCTOR: Never be cruel. Never be cowardly. Hate is always foolish. Love is always wise. Always try to be nice, but never fail to be kind.

DOCTOR: We’re all stories, in the end. Just make it a good one, eh?

DOCTOR: The way I see it, every life is a pile of good things and bad things. The good things don’t always soften the bad things, but vice versa, the bad things don’t always spoil the good things or make them unimportant.

DOCTOR: Do you know like we were saying about the Earth revolving? It's like when you were a kid. The first time they tell you the world's turning and you just can't quite believe it because everything looks like it's standing still. I can feel it. The turn of the Earth. The ground beneath our feet is spinning at a thousand miles an hour, and the entire planet is hurtling round the sun at sixty seven thousand miles an hour, and I can feel it. We're falling through space, you and me, clinging to the skin of this tiny little world, and if we let go. That's who I am. Now, forget me, Rose Tyler. Go home.

DOCTOR: You feel that pounding in your heart? That tightness in the pit of your stomach? The blood rushing to your head, do you know what that is? That's adventure. The thrill and the fear, and the joy of stepping into the unknown. That's why we're all here, and that's why we're alive!

DOCTOR: I say, what a wonderful butler. He's so violent.