Mandy Pinsky wrote a great transcript of the whole scene:

Varys: A thousand blades, taken from the hands of Aegon's fallen enemies. Forged in the fiery breath of Balerion the Dread.

Baelish: There aren't a thousand blades. There aren't even two hundred. I've counted.

Varys: Heh. I'm sure you have. Ugly old thing.

Baelish: It has a certain appeal.

Varys: The Lysa Arryn of chairs. Shame you had to settle for your second choice.

Baelish: Early days, my friend. It is flattering really, you feeling such dread at the prospect of me getting what I want.

Varys: Thwarting you has never been my primary ambition, I promise you. Although, who doesn't like to see their friends fail now and then.

Baelish: You're so right. For instance, when I thwarted your plan to give Sansa Stark to the Tyrells, if I'm going to be honest, I did feel an unmistakable sense of enjoyment there.

Baelish: But your confidant, the one who fed you information about my plans, the one you swore to protect... you didn't bring her any enjoyment, and she didn't bring me any enjoyment. She was a bad investment on my part.

Baelish: Luckily, I have a friend who wanted to try something new. Something daring. And he was so grateful to me for providing this fresh experience.

Varys: I did what I did for the good of the realm.

Baelish: The realm. Do you know what the realm is? It's the thousand blades of Aegon's enemies- a story we agree to tell each other over and over, until we forget that it's a lie.

Varys: But what do we have left, once we abandon the lie? Chaos? A gaping pit waiting to swallow us all.

Baelish: Chaos isn't a pit. Chaos is a ladder. Many who try to climb it fail, and never get to try again. The fall breaks them. And some, given a chance to climb, they refuse. They cling to the realm, or the gods, or love. Illusions. Only the ladder is real. The climb is all there is.

Chaos is a Ladder wallpaper:

http://pandawhale.com/post/19898/chaos-is-a-ladder-quote-wallpaper