Who said "Gratitude is the highest form of grace."?

This quote is attributed to Niles Crane.

Gratitude is the highest form of grace. - Niles Crane

"Gratitude is the highest form of grace."

Niles Crane Gratitude

"I'm not drinking to escape reality, I'm drinking to enhance it."

"The mind is a terrible thing to waste, but a wonderful thing to refine."

"One must maintain certain standards, or civilization crumbles."

"Love is the most exquisite torture known to mankind."

"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"