Who said "Gratitude is the foundation of a grateful life."?

This quote is attributed to Knuckles.

Gratitude is the foundation of a grateful life. - Knuckles

"Gratitude is the foundation of a grateful life."

Knuckles Gratitude

"I'm the last one standing!"

"Gotta protect this Master Emerald!"

"Nobody messes with the Master Emerald while I'm around!"

"I may not be the smartest guy, but I know what's 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"