Who said "Know thyself, and you'll know your enemy."?

This quote is attributed to Lannister.

Know thyself, and you'll know your enemy. - Lannister

"Know thyself, and you'll know your enemy."

Lannister Education

"A Lannister always pays his debts."

"I am the god of tits and wine."

"You are an awful man."

"I drink and I know things."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."