"That’s not a monster," I told Cersei, "that’s just a baby."

I feel like that’s probably something Tyrion’s never been told before - something he’s never even quite believed himself - and that’s why he reacted so strongly to Oberyn’s words.

To have someone assert that, as early as his birth, he could be seen as something other than a monster - it’s not like we have to wonder how long he’s ached to hear that and what that must mean to him.