Gratitude is so much a part of many psychotherapies as well as spiritual paths. I believe it is because gratitude is a natural way to foster positive movement in a person. The result of this movement is more happiness.
The mind is a willing servant, and it thinks what a person wants it to think. As Abraham Lincoln once said, "Most folks are about as happy as they make up their minds to be".
Gratefully Yours, Cheryl Deaner, LMFT