Petyr Baelish: When boys and girls live in the same home, awkward situations can arise. Sometimes, I've heard, even brothers and sisters develop certain affections. And when these affections become common knowledge, well... that is an awkward situation indeed, especially in a prominent family. But prominent families often forget a simple truth, I've found.
Cersei Lannister: And which truth is that?
Petyr Baelish: Knowledge is power.
Varys: When you imagine yourself up there, how do you look? Does the crown fit? Do all the lords and ladies simper and bow, the ones who sneered at you for years?
Petyr Baelish: It's hard for them to simper and bow without heads.
Varys: A man with great ambition and no morals... I wouldn't bet against you.