The only truth we will ever know is about ourselves. The only certainty is our own desire. The only knowledge is of our own thought processes. Every action we perpetuate, every event we partake in, is ultimately aimed at developing this knowledge. At enhancing our pervasive sense of self-identity.
Wealth is not important. By its very nature, it is temporal. Happiness derived from wealth is, therefore, inconsequential. Success measured by wealth is meaningless.
Relationships developed with other people are important. They are important because they allow us a window into another soul. We may never understand another- but it provides us perspective. It gives us meaning.
But, ultimately, all that matters is sticking to your morals. If nothing matters - all that matters is what we do. The only certainy we know relates to ourself. It is therein that we will develop lasting happiness. When it comes down to it, the only person you have to justify your choices to is yourself. The only person you have to face in the mirror is yourself. Expediency, for the sake of attaining a higher purpose, is folly - because the highest purpose is self-discovery.
I haven't done identity and belonging, so its likely that all of that is a rambly piece of crap... but just my initial thoughts.