Two Key Components:

Why? Because being thankful re-wires our brains [see the science behind this and the power of being grateful], AND because serving others allows us to focus on healing others rather than lingering on our own suffering/pain.
*"....share your food with the poor, and then your healing will come..." [Isaiah ?]

"Forgiveness is giving up the right to retaliate. Forgiveness is the willingness to have something happen the way it happened. It's not true that you can't forgive something; it's a matter of the will, and you always have the choice. Forgiveness is never dependent on what the other person does or does not do; it is always under our control. Forgiveness is giving up the insistence on being understood.... Jesus forgave those who crucified him. This is a radically new way of thinking. For those who accept and practice this discipline, there is a release of energy and a sense of freedom." - Pixie Koestline Hammond; "For Everything There Is a Season."

Blog: Sweet Hour of Thanksgiving
https://subversive1.blogspot.com/2016/03/sweet-hour-of-thanksgiving.html

The Power To Love and Forgive
https://subversive1.blogspot.com/2014/01/the-power-to-love-and-to-forgive.html

How Happiness [and Thanksgiving] Affect Your Bottom Line
https://www.linkedin.com/pulse/how-happiness-affects-your-bottom-line-keith-giles/