You may say, the money you own, the love promised by your spouse, the house you live in, the knowledge you learn, your social status people look up to, the bodily beauty and health conditions you are proud of, well even the spiritual achievement you have make you happy.
Ask yourself a simple question, will you be unhappy if some of these conditions disappear or simply weaken one day? Chances are, you will not be happy if you are attached to any external conditions, by the way, I am not saying you should be happy when you are looted or when you see your house on fire or when you get sick, it is more than OK to express your emotions such as anger & grief when you face life challenges, yet you can choose to be in a peaceful zone in your heart if you depend on nothing for happiness, where a state of unshakable balance and stability can be felt even when life changes it’s course for some reasons and purposes. What makes you happy can easily make you unhappy if you depend on a certain external conditions for happiness for everything is impermanent, changes is the only unchanged fact.
Depending on nothing for happiness is what really makes and keeps us happy, no matter what.