What really matters?

As I pack up precious belongings ready to move to a new house one day, I ponder what these possessions are really worth.  What are they worth to other people? Anything? And then I wonder what is anything worth? Not just possessions, but things that cannot be seen. What matters?
There is a wonderful piece of writing by Michael Josephson, called "A Life That Matters" and it's worth looking up and reading in its entirety. Here I quote a small snippet from it:
".....What will matter is not what you bought, but what you built; not what you got, but what you gave. What will matter is not your success, but your  significance. What will matter is not what you learned, but what you  taught...."
To try and live by these words is a big ask, but worth a try.