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

This quote is attributed to Nikolai Rostov.

Gratitude is the memory of the heart. - Nikolai Rostov

"Gratitude is the memory of the heart."

Nikolai Rostov Gratitude

Character in War and Peace

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"A man is always happy when he has a good wife."

"We cannot change what we are, only what we do."

"Youth's greatest gift is not life but the promise of life."

"Loyalty transcends all other virtues."

"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"