Who said "Gratitude is the mark of a civilized being."?

This quote is attributed to Jean-Luc Picard.

Gratitude is the mark of a civilized being. - Jean-Luc Picard

"Gratitude is the mark of a civilized being."

Jean-Luc Picard Gratitude

"Make it so."

"I am not interested in cows."

"Tea. Earl Grey. Hot."

"The line must be drawn here. This far, no further."

"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"