Who said "Gratitude is the memory of the heart."?

This quote is attributed to Sancho Panza.

Gratitude is the memory of the heart. - Sancho Panza

"Gratitude is the memory of the heart."

Sancho Panza Gratitude

Character in Don Quixote

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"Every dog has his day."

"All that glisters is not gold."

"Proverbs are short sentences drawn from long experience."

"Hunger is the best sauce."

"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"