Who said "Muriel has been so good to me."?

This quote is attributed to Courage the Cowardly Dog.

Muriel has been so good to me. - Courage the Cowardly Dog

"Muriel has been so good to me."

Courage the Cowardly Dog Gratitude

"Courage, the cowardly dog."

"What's wrong, Muriel?"

"Oh, the things I do for love."

"Stupid Eustace!"

"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"