Who said "Gratitude is for people who feel indebted to society."?

This quote is attributed to The Joker.

Gratitude is for people who feel indebted to society. - The Joker

"Gratitude is for people who feel indebted to society."

The Joker Gratitude

"All you care about is money. This town deserves a better class of criminal."

"I'm not a monster. I'm just ahead of the curve."

"Madness is like gravity. All it takes is a little push."

"Everything burns."

"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"