Don’t make people into heroes, John. Heroes don’t exist. And if they did, I wouldn’t be one of them.

The Great Game

[...] Forget your faith in me. I took you with me because I was vain. Because I wanted to be adored. Look at you. Glorious Pond. The girl who waited for me. I'm not a hero. I really am just a mad man in a box.

The God Complex

Courage isn't just a matter of not being frightened, you know. It's being afraid and doing what you have to do anyway.

Planet of the Daleks

Anybody remotely interesting is mad in some way.

The Greatest Show in the Galaxy

The Doctor is no longer here, you are stuck with me!

Face the Raven

Good men don't need rules. Today is not the day to find out why I have so many.

A Good Man Goes to War

You want weapons? We're in a library. Books are the best weapon in the world. This room's the greatest arsenal we could have. Arm yourself!

Tooth and Claw

Never trust a hug. It's just a way to hide your face.

Death in Heaven

The very powerful and the very stupid have one thing in common. They don't change their views to fit the facts. They change the facts to fit their views. Which can be uncomfortable if you happen to be one of the facts that needs changing.

The Face of Evil

There is good and there is evil. I left Gallifrey to answer a question of my own. By any analysis, evil should always win. Good is not a practical survival strategy - it requires loyalty, self-sacrifice and love. And so, why does good prevail? What keeps the balance between good and evil in this appalling universe? Is there some kind of logic? Some mysterious force?

Twice Upon a Time

That deep and lovely dark. We'd never see the stars without it.

Listen

I am and always will be the optimist. The hoper of far-flung hopes and the dreamer of improbable dreams.

The Almost People

I may talk like a fool, but I always know what I’m talking like a fool about!

Caerdroia

I'm here to cure and help, not to assess.

The Legacy of Time: Collison Course

And because sometimes, on a good day, if I try very hard… I’m not some old Time Lord who ran away. I'm the Doctor.

The Witch's Familiar

Right now, I’m a stranger to myself. There’s echoes of who I was, and a sort of… call towards who I am, and I have to hold my nerve and trust all these new instincts, shape myself towards them. I’ll be fine. In the end. Hopefully.

The Woman Who Fell to Earth

You. You listen to me. You're gonna be alone now. And you're very bad at that. You're gonna be furious and you're gonna be sad. But listen to me, don't let this change you. No, listen. Whatever happens next, wherever she is sending you, I know what you're capable of. You don't be a warrior. Promise me. Be a Doctor.

"Face the Raven"