Darius usefulness is almost as hard to define as happiness. Me? I’m most infuenced by the Stoic philosophers. Happiness is a byproduct of the well lived life. One should live one’s life to acquire virtue. One should recognize that there are things within your control and other outside your control. Things which are outside your control should be nothing to you. There is also what happens to you and how you decide to feel about what happens to you. You may not be able to control what happens to you but you can control how you process it. You should seek virtue, serenity and equanimity and resiliancy in the face of adversities life throws in your path. Your serenity, equanimity and resiliancy is self empowering, and to me, happiness. You can’t be useful in any meaningful way until you are first useful to yourself.