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

This quote is attributed to Don Quixote.

Gratitude is the memory of the heart. - Don Quixote

"Gratitude is the memory of the heart."

Don Quixote Gratitude

Character in Don Quixote

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"The Knight of the Sorrowful Countenance"

"I know who I am, and who I may be, if I choose."

"Facts are the enemy of truth."

"The pen is mightier than the sword."

"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"