Who said "Solitude is where a man truly knows himself."?

This quote is attributed to Lannister.

Solitude is where a man truly knows himself. - Lannister

"Solitude is where a man truly knows himself."

Lannister Solitude

"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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."