Twice Upon a Time

Twelfth Doctor: Oh. There it is. Silly old universe. The more I save it, the more it needs saving. It's a treadmill.

[the TARDIS makes soft chirping noises to the Doctor]

Twelfth Doctor: Yes, yes I know. They'll get it all wrong without me.

[pauses]

Twelfth Doctor: Well... I suppose one more lifetime won't kill anyone. Well... except me.

[looks down at his hand, glowing with regeneration energy, then wearily looks back up at the TARDIS]

Twelfth Doctor: You wait a moment, Doctor. Let's get it right. I've got a few things to say to you. Basic stuff first: Never be cruel, never be cowardly, and never ever eat pears! Remember, hate is always foolish, but love is always wise. Always try to be nice, but never fail to be kind. Oh. And you mustn't tell anyone your name.

[smiles to himself]

Twelfth Doctor: No one would understand it, anyway! Except...

[cries out suddenly in pain, crumples to the ground, gasps for breath]

Twelfth Doctor: Except... children. Children can hear it sometimes, if their hearts are in the right place, and the stars are too. Children can hear your name. But nobody else.

[slowly and painfully rises back up to his feet]

Twelfth Doctor: Nobody else. EVER.

[stands up, tall and proudly]

Twelfth Doctor: Laugh hard. Run fast. BE KIND.

[a pause, then softly]

Twelfth Doctor: Doctor, I let you go.