Who said "Gratitude is a luxury afforded only to the successful."?

This quote is attributed to Penguin.

Gratitude is a luxury afforded only to the successful. - Penguin

"Gratitude is a luxury afforded only to the successful."

Penguin Gratitude

"I am not a human, I am an animal. A cold-blooded animal."

"You poor, unfortunate fool."

"Life's a bitch, isn't it?"

"I've been dead once already. It's not so bad."

"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"