The Doctor: Don't blink. Don't even blink. Blink and you're dead. Don't turn your back. Don't look away. And don't blink.

The Doctor...is embarrassingly human for an alien.

Though the man above might say hello, expect no love from the beast below

You don't want to take over the universe. You wouldn't know what to do with it beyond shout at it.

Hitler: Thank you, whoever you are. I think you just saved my life. The Doctor: Believe me... It was an accident.

Sherlock Holmes becomes more human and more adept at fitting in with a lot of people, but he remains separate from the human race because he finds that a better place to observe that from. He stays on the mountain top because there, he can see clearly.

You want weapons? We're in a library! Books! The best weapons in the world!