Or maybe sometimes things are less than the sum of their parts, alright? You're a lot better than you give yourself credit for, Donna Noble, and the Doctor's the one who was too daft to notice how you really felt until I came along with your memories to spell it out for me.

I've been thinking about it, too, Donna, and you know what I think? I think when you mash two personalities together into one, something is going to go wrong with that. And I'm trying, but when I get it wrong, that's me getting it wrong.