Who said "Gratitude opens the doors to true happiness."?

This quote is attributed to Frasier Crane.

Gratitude opens the doors to true happiness. - Frasier Crane

"Gratitude opens the doors to true happiness."

Frasier Crane Gratitude

"I'm listening."

"Tossed salad and scrambled eggs."

"It's a Frasier kind of day."

"Excelsior!"

"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"