Who said "Gratitude is the foundation of happiness."?

This quote is attributed to Rex.

Gratitude is the foundation of happiness. - Rex

"Gratitude is the foundation of happiness."

Rex Gratitude

"I'm a dinosaur! RAWR!"

"Oh no, oh no, oh no, oh no, oh no!"

"I can't take the pressure!"

"Everything's gonna be okay, right?"

"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"