[The Doctor turns around and doesn't look at Albus because those words rattle into his mind from that voice and it's much harder to lie to himself with that and to Albus]

It was impossibly amazing being on a planet orbiting on the event horizon of a black hole.

Don't suppose you want to see more of the library?

[Even if The Doctor has already started off and he did it - he didn't lie but he changed the subject - sort of. He has to ask Albus he has to ask painful questions. Otherwise what is existing beyond your regeneration life if one is broken?]