Jon Snow: Why do you read so much?

Tyrion Lannister: If I'd been born a peasant they might've left me out in the woods to die. Alas, I was born a Lannister of Casterly Rock. Things are expected of me. I must do my part for the honor of my house, wouldn't you agree? But how? Well, my brother has his sword and I have my mind. And a mind needs books like a sword needs a whetstone. That's why I read so much, Jon Snow.