“Who I am is where I stand. Where I stand is where I fall.”

“Happiness is nothing unless it exists side by side with sadness.”

TENTH DOCTOR: What? What?

SIXTH DOCTOR: What are you afraid will happen if you pause for breath?

TENTH DOCTOR: That there won't be another.

“The mediator between the head and the hands must be the heart. If only.”

“Lucie, there's a lot of darkness out there. Some of it where Orbis used to be. But you know something? We wouldn't notice any of it if it weren't for all those little pinpricks of light; planets and stars. And that's where I go whenever I feel sad. The next bit of light in the darkness. Keep on moving. Never look back. Well, hardly ever.”

“Time And Relative Dimension In Space. TARDIS for short. You're safe in here. You're safe in here and you always will be.”

LEELA: I was so alone in the world of dreams when you left… The wildlands were dark and so quiet. I… I do not wish to be alone.

ROMANA: There will be a place for you with me. For always. Whatever face I wear.

“As my mum told me once - don't put anything off until tomorrow... Except giving up.”

HAYDEN: It is a necessary evil.

DOCTOR: Oh I've met evils you wouldn't believe, gods and devils, warewolves and vampires, every monster every child's ever imagined creeping out from under the bed and you know what? They're all real. But a necessary evil - that's the only one that's a fiction.