A mind needs books like a sword needs a whetstone - Game of Thrones

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.
My father was the Hand of the King for 20 years.
Until your brother killed that King.
Yes, until my brother killed him.
Life is full of these little ironies.
My sister married the new King and my repulsive nephew will be King after him.
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.