Doctor: See, there's the thing. I'm the Doctor, but beyond that, I - I just don't know. I literally do not know who I am. It's all untested. Am I funny? Am I sarcastic? Sexy? Right old misery? Life and soul? Right-handed? Left-handed? A gambler? A fighter? A coward? A traitor? A liar? A nervous wreck? I mean, judging by the evidence, I've certainly got a gob.
Doctor: These human beings. Consider their potential. From the day they arrive on the planet and blinking step into the sun. There is more to see than can ever be seen. More to do than - no, hold on...Sorry, that's 'The Lion King'. But the point still stands. Leave them alone!