Who said "Gratitude is a luxury the powerful cannot afford."?

This quote is attributed to Stannis Baratheon.

Gratitude is a luxury the powerful cannot afford. - Stannis Baratheon

"Gratitude is a luxury the powerful cannot afford."

Stannis Baratheon Gratitude

"Duty is the death of love."

"I am of the night."

"The night is dark and full of terrors."

"A king does not ask, he commands."

"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"