Who said "Gratitude is what keeps you going when times are tough."?

This quote is attributed to Courage the Cowardly Dog.

Gratitude is what keeps you going when times are tough. - Courage the Cowardly Dog

"Gratitude is what keeps you going when times are tough."

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"