The field of psychology has usually concentrated on trying to understand aberrations and psychological problems. But now a strain is concentrating on “positive psychology,” seeking to understand mental well-being. A key aspect is gratitude. People who have an attitude of thankfulness show a whole range of other positive traits, not only psychologically but physicially!
From Gratitude | Psychology Today.
Gratitude is an emotion expressing appreciation for what one has—as opposed to, for example, a consumer-driven emphasis on what one wants. Gratitude is getting a great deal of attention as a facet of positive psychology: Studies show that we can deliberately cultivate gratitude, and can increase our well-being and happiness by doing so. In addition, gratefulness—and especially expression of it to others—is associated with increased energy, optimism, and empathy.