Everybody knows that everybody dies. But not every day. Not today. Some days are special. Some days are so, so blessed. Some days, nobody dies at all… - Steven Moffat

I think people have come to think a plot hole is something which isn’t explained on screen. A plot hole is actually something that can’t be explained.

When you run with the Doctor, it feels like it'll never end. But however hard you try you can't run forever. Everybody knows that everybody dies and nobody knows it like the Doctor. But I do think that all the skies of all the worlds might just turn dark if he ever, for one moment, accepts it.

First there were the Daleks...And then there was a man who fought them. And then, in time — he died. There are a few, of course, who believe that this man somehow survived, and that one day he will return. For both our sakes, dearest Hannah, we must hope these stories are true.