6 Habits of Highly Grateful People: "Gratitude (and its sibling, appreciation) is the mental tool we use to remind ourselves of the good stuff. It’s a lens that helps us to see the things that don’t make it onto our lists of problems to be solved. It’s a spotlight that we shine on the people who give us the good things in life. It’s a bright red paintbrush we apply to otherwise-invisible blessings, like clean streets or health or enough food to eat."