Who said "Gratitude sustains the soul."?

This quote is attributed to Ryland Grace.

Gratitude sustains the soul. - Ryland Grace

"Gratitude sustains the soul."

Ryland Grace Gratitude

Character in Project Hail Mary

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"I'm not stranded. I'm home."

"Science rules."

"Sometimes the only way out is through."

"I have to stay alive. That's the mission."

"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"