What year are we in?
Around 2084.
[Looking around] Little seems to have changed since my time.
Absolutely nothing, Tegan. There are still two power blocs, fingers poised to annihilate each other.
S21 E1Warriors of the Deep
I sometimes wonder why I like the people of this miserable planet so much.
Tegan, make a wish! [Tegan shuts her eyes]
NNilson
[pointing a gun at the Doctor]: Goodbye, Doctor!
Goodbye! [shoots him with the ultra-violet light generator]
[On the violence that resulted in the deaths of humans, Silurians, and Sea Devils alike.]
They're all dead, you know.
[looking around at the carnage] There should have been another way.
[After the Sea Devils remove the other humans apart from Commander Vorshak and the Doctor, Icthar turns to the latter]
IIcthar
I will listen to what you say, but I should tell you that the Silurians have long since abandoned the way of mediation.
So it seems. Why? A civilized race like yours waging unprovoked war?
IIcthar
Defensive war, Doctor! There is a distinction. Silurian law forbids any other.
Defensive? There's no such thing. When we last met, your supreme wish was to live at peace with the other inhabitants of this planet. Now why change such an enlightened policy?
IIcthar
Our policy has always been peaceful survival. All that has changed is the means by which it can be achieved.
By actions such as we've seen here?
IIcthar
You forget! Twice we offered the hand of friendship to these ape-descended primitives, and twice we were treacherously attacked, our people slaughtered! It will not happen again.
There can be no alternative to peaceful co-existence.
IIcthar
There is, Doctor! A final solution!
[Realizing what this means] Genocide?! When everything you Silurians hold sacred forbids it?!
IIcthar
We will harm no one. These ape primitives will destroy themselves. We, Doctor, will merely provide the pretext.
You'll trigger the war this base was designed to fight.
IIcthar
Yes. And these human beings will die as they have lived: in a sea of their own blood!
S21 E2The Awakening
We're running out of places to run.
That's the story of our lives
GSir George
You speak treason!
Fluently!
S21 E3Frontios
[Cheerfully reading about Frontios from the TARDIS log] Fleeing from the imminence of a catastrophic collision with the Sun, refugees from the doomed planet Earth...
And if anyone happens to ask whether I made any material difference to the welfare of this planet, you can tell them I came and went like a summer cloud.
Oh, marvelous. You're going to kill me. What a finely tuned response to the situation.
A risk shared is a risk doubled.
[Trying to pass Tegan off as an android] I got this one cheap because the walk's not quite right. And then there's the accent...
S21 E4Resurrection of the Daleks
If I were you, I'd be dead.
I lack your practice, Davros.
You are soft, like all Time Lords. You prefer to stand and watch. Action requires courage; something you lack.
I'm not coming with you.
I beg your pardon?
I'm tired of it.
What's the matter?
A lot of good people have died today. I'm sick of it.
You think I wanted it this way?
No. It's just I don't think I can go on.
You want to stay on Earth?
My aunt Vanessa said, when I became an air stewardess, if you stop enjoying it, give it up.
Tegan...
It's stopped being fun, Doctor. Goodbye. [Shakes the Doctor's hand] Turlough. [Shakes Turlough's hand]
Goodbye.
I'll miss you both. [turns to leave, stepping over bodies as she does]
No, no, don't leave, not like this.
I must! I'm sorry! Goodbye. [Runs out of the warehouse in tears]
Once the Doctor has been exterminated, I should build a new race of Daleks.They will be even more deadly! And I Davros, shall be their leader! This time we shall triumph! The Daleks shall once more become the supreme beings!!!
These quotes come from Wikiquote's Doctor Who pages and are available under the Creative Commons Attribution-ShareAlike License.