However, each of us is at the center of our own universe, and from that context, a variety of things are important or unimportant. From the context of self, we derive importance.
That universe exists only as long as the self exists. In that context, what you deem important is important. What you deem unimportant is unimportant. And those states shift over time.
I'm not well read in philosophy. I imagine what I've written above is probably a pretty commonplace observation, so I'm sure someone has written more on the subject.