DOCTOR: Oh, it's all right for you. You're young, strong, fit of limb. You're confident in your mission, your energy's boundless, you're highly motivated to success. You even have a gun to enforce your will upon others. But look at me. I'm old, lacking in vigour. My mind's in a turmoil. I no longer know if I'm coming, have gone or have even been. I'm falling to pieces. I no longer even have any clothes sense.

PERI: Oh, stop feeling sorry for yourself.

DOCTOR: Self-pity is all I have left.