Fourth Doctor quotes from Doctor Who

Tell me on the way Brigadier! Tell me on the way! You must cultivate a sense of urgency.

[measuring a sizable hole with his scarf] It seems you have a very large rat brigadier — maybe you should employ the services of a very large cat?

In science - as in morality - the end never justifies the means.

The trouble with computers, of course, is that they're very sophisticated idiots. They do exactly what you tell them at amazing speed. Even if you order them to kill you. So if you do happen to change your mind, it's very difficult to stop them from obeying the original order. [stops computer from destroying Earth] But not impossible.

Homo sapiens. What an inventive, invincible species. It's only a few million years since they crawled up out of the mud and learned to walk. Puny, defenceless bipeds. They've survived flood, famine and plague. They've survived cosmic wars and holocausts. And now, here they are, out among the stars, waiting to begin a new life. Ready to outsit eternity. They're indomitable. Indomitable.

I might've been saying something important. (horrified expression) I was saying something important!

It may be irrational of me, but human beings are quite my favourite species.

I've lost my sonic screwdriver, I feel absolutely lost without it.

Hello? Sarah?

Oh. It’s you again. Can’t say I’m delighted. It’s no use pretending.

[talking to the two men and holding hands with Harry and Sarah Jane] I should stand back if I were you. [Disappearing] I mean it should be all right. [Reappearing] But you never know quite, do you? [Disappears again]

[approaching two guards] Excuse me, can you help me? I'm a spy. [bangs their heads together, knocking them out]

[last words of the episode] Failed? No, not really. You see, I know that although the Daleks will create havoc and destruction for millions of years, I know also that out of their evil must come something good.

You've no home planet, no influence, nothing! You're just a pathetic bunch of tin soldiers skulking about the galaxy in an ancient spaceship!

[after unclasping his harness and it doesn't explode] Well, I'm impressed.

Oh please, don't call me human. Just "Doctor" would do very nicely, thank you.