Who said "Gratitude is wasted on people I've already paid."?

This quote is attributed to Mr. Burns.

Gratitude is wasted on people I've already paid. - Mr. Burns

"Gratitude is wasted on people I've already paid."

Mr. Burns Gratitude

"Release the hounds!"

"I'm trying to be a better man, but it's exhausting."

"Money can be exchanged for goods and services."

"Smithers, release the robotic Richard Simmons!"

"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"