Who said "Gratitude is saying thanks for the cool stuff."?

This quote is attributed to Bart Simpson.

Gratitude is saying thanks for the cool stuff. - Bart Simpson

"Gratitude is saying thanks for the cool stuff."

Bart Simpson Gratitude

"Eat my shorts!"

"Ay caramba!"

"Don't have a cow, man."

"Cowabunga!"

"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"