Who said "Gratitude opens doors that bitterness locks forever."?

This quote is attributed to Shallan Davar.

Gratitude opens doors that bitterness locks forever. - Shallan Davar

"Gratitude opens doors that bitterness locks forever."

Shallan Davar Gratitude

Character in The Way of Kings

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"I wish I could see the future."

"The parshmen are slaves, but they need not be."

"Words matter. Choose them carefully."

"Justice demands action."

"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"