Who said "Gratitude is weakness disguised as virtue."?

This quote is attributed to Lannister.

Gratitude is weakness disguised as virtue. - Lannister

"Gratitude is weakness disguised as virtue."

Lannister Gratitude

"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."

"Gratitude makes life richer."

"A grateful heart is a happy heart."

"Respect those who came before us."

"Life's greatest treasures are the people we love"