Who said "I'm grateful for nothing, which keeps me realistic."?

This quote is attributed to Oscar the Grouch.

I'm grateful for nothing, which keeps me realistic. - Oscar the Grouch

"I'm grateful for nothing, which keeps me realistic."

Oscar the Grouch Gratitude

"I love trash. Why do you think I live in a can?"

"Scram! Can't you see I'm trying to be miserable here?"

"The more it stinks, the more I like it."

"Why is everyone always trying to make me happy? It's exhausting."

"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"