Yes really: Happiness Comes From Within. Never look for happiness outside of your own soul.
Yes, you can find minutes of happiness by people you love, things you have or success you achieve. But this moments never will last. And if you think that this is the only kind of happiness you will feel empty if these moments are gone. If you understand that happiness comes from within and can be made in each moment by yourself, you are able to feel happy as often as you want to or make it a kind of permanent feeling.