Who said "Gratitude opens the door to contentment and peace"?

This quote is attributed to Platon Karataev.

Gratitude opens the door to contentment and peace - Platon Karataev

"Gratitude opens the door to contentment and peace"

Platon Karataev Gratitude

Character in War and Peace

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"A man is happy so long as he chooses to be happy."

"Faith is taking the first step even when you do not see the whole staircase."

"A man is happy so long as he chooses to be happy."

"Man can endure almost anything if he has faith."

"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"