What is the most precious thing in my life?

The most precious thing...
Is that thing which has shape?
For example, the children are looking forward to get a present from Santa Claus in Christmas, their feeling are precious.
Precious thing is not always happiness.
I think it include sadness.
If we do not have sadness, happiness become worthless.
For me, the most precious thing is memory.
It is a track.
It is our own story.
The very thing of life.
We have a lot of memory.
Past things are made beautiful, more it looks excellent.
Memory is not always good.
But including it makes better to our life.
Our life which we are living Now.
The own story we are making is the most precious thing that other people cannnot experience.