[the Doctor has been called many things by those who truly know him, but that - well, that's a first, and his laugh is almost genuine]

I do nothing else, Doctor.

[the laughter fades from his features, leaving something grim and weary; another pretence, in its way, but there's sincerity to it, and the weight in his words]

Tell me - do you know what it's like to send children to die? To command good people to commit atrocities in the name of a better world? To comfort those left behind?