“This is one of many reasons that religion, when done correctly, is important to happiness—it regularly inculcates gratitude. People who give thanks to God before each meal, for example, regularly inculcate gratitude in themselves. Can a secular family invoke gratitude at each meal? In theory, yes. The family members can bow their heads and thank the farmer who planted and harvested their food, the truckers who shipped it to market, and the local supermarket. But I have never heard of a family doing so.”
“Among Christians, for example, blessings of gratitude are regularly offered for food and at gatherings of friends. Having to express these words of gratitude on a regular basis undoubtedly induces some degree of gratitude.”

(Excerpt from Happiness Is a Serious Problem, pg. 65, by Dennis Prager)