The idea that happiness is more than just how we feel at any one moment has been around since Aristotle. Today, psychology draws a distinction between emotional well-being in the present and overall life satisfaction. This distinction, however, is a mistake. Life satisfaction is just a small part of our overall emotional well-being. Happiness is always judged in the present, not from some abstract vantage point that views our life as a whole, argues Steven Campbell-Harris.

Picture two kinds of life.

In one, your day-to-day is mostly stressful and anxiety-provoking, with occasional bursts of joy or pleasure. Nevertheless, when you reflect on your life you find that - despite its difficulties- you are satisfied. You feel you make a difference in the world and judge your life worthwhile.