“Study the past if you would define the future. --CONFUCIUS”

“It's been my experience, Langford, that the past always has a way of returning. Those who don't learn, or can't remember it, are doomed to repeat it.”

“I don't think my mum ever understood my love of Doctor Who. Surely her strongest memory would have been me, standing at the top of the stairs, crying about how the "jelly men" were going to get me? Sorry, Mum, for those sleepless nights, but it was with good reason they called it Terror of the Zygons.”

“If you want to live your whole life free from pain,you must either be a god or a corpse.”

“It's the circumstances that create fear. How you respond is all you can control. Concentrate on that, and you'll always succeed.”

“Follow your heart. It rarely leads you astray. It's thinking that gets us into trouble.”

“Something about history stirred him. He liked following in its footsteps.”