To know who you are, and what's you truthful purpose in this "inity", because it is in that discovery , we will be discovering our true happiness at the same time. I was reading something last night and it was quite similar , and related to your question.
At one point I thought it was money, and I was flying , tearing us my youth with the thought of money. Then I realized that the richest people as I started researching their name , them what they were doing .
I have come to realize that to be happy was the most important , them I began looking at all those I thought was the epitome of happiness around me, and in the world. Look at those who were smiling genuinely, and who was enjoying their lives to the max in this world, eating , drinking and partaking of all God have placed here. It amazing what I found.
There may be a universal definition ,and it might say money , and I won't agree, but to each his own.
This is interesting so I will be reading comments.