When we are completely happy, we also feel that we have more energy.
That can translate into more productive days and enjoyment of day-to-day
activities. Conversely, continual unhappiness and longing to be happy drain us.
Although pleasure can lighten unhappy moments, happiness is the result of
long-term meaning. Whenever we engage in work that we really love to do, we
will always lose track of time and feel an abundance of energy.