“Time travel is like visiting Paris. You can't just read the guidebook. You've got to throw yourself in! Eat the food, use the wrong verbs, get charged double and end up kissing complete strangers! Or is that just me?”

“Nothing’s sad until it’s over, and then everything is.”

“People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint, it's more like a big ball of wibbly-wobbly, timey-wimey... stuff.”

“Two hearts. One happy, one sad.”

DOCTOR: The Daleks have failed! Why don't you finish the job and make the Daleks extinct. Rid the Universe of your filth. Why don't you just die?

DALEK: You would make a good Dalek.

BILL: So, the Time Lords, bit flexible on the whole man-woman thing, then, yeah?

DOCTOR: We're the most civilised civilisation in the universe. We're billions of years beyond your petty human obsession with gender and its associated stereotypes.

BILL: But you still call yourselves Time Lords?

DOCTOR: Yeah. Shut up.

MASTER: Is the future going to be all girl?

DOCTOR: We can only hope.

“Without hope. Without witness. Without reward.”

DOCTOR: Now, first things first. Be honest. How do I look?

ROSE: Umm... different.

DOCTOR: Good different or bad different?

ROSE: Just...different.

DOCTOR: Am I... ginger?

ROSE: No, you're just sort of... brown.

DOCTOR: Aw, I wanted to be ginger! I've never been ginger!

CLARA: Be a doctor. You told me the name you chose was a promise. What was the promise?

TENTH DOCTOR: Never cruel or cowardly.

WAR DOCTOR: Never give up, never give in.

“I just want you to know there are worlds out there, safe in the sky because of her. That there are people living in the light, and singing songs of Donna Noble, a thousand million light years away. They will never forget her, while she can never remember. And for one moment, one shining moment, she was the most important woman in the whole wide universe.”

DOCTOR: My entire understanding of physical space has been transformed! Three-dimensional Euclidean geometry has been torn up, thrown in the air and snogged to death! My grasp of the universal constants of physical reality has been changed forever!

DOCTOR: Sorry. I've always wanted to see that done properly.