For every expert there is an equal and opposite expert.

“All the great unanswered questions of the world will be answered. Who are we? W…”

“This must have been how it all began with Chymes,” sighed Jack. “A smallomissio…”

“It wasn’t going to be hard…it was going to be impossible. It wouldn’t deter me.…”

“Don't ever call me mad, Mycroft. I'm not mad. I'm just ... well, differently mo…”