Did it not come out of the deeply held religious belief that we should regularly express our appreciation and grateful thanks to Almighty God for all of His rich blessings we enjoy in this life?
As someone that has had more close calls with death than I care to think about, I never, upon awakening, get out of bed without giving thanks for being alive. Second to being alive, is the gift of truly being free. Such freedom is what fully allows thanksgiving, giving thanks, to be meaningful in all aspects of life.
In time, I can affirm, one becomes a living gift of thanksgiving, of giving thanks, that is shared with everyone and in behalf of all peace-loving gracious people.