The “10, 000 things” is a shorthand way of talking about all the experiences – good and bad – which arise and pass away in our lifetime. It stands for all of reality, which contains the right mix of experiences for our growth, and with its ebbs and flows is continually rearranging itself.
The ten thousand things arise together; In their arising is their return.
Now they flower, and flowering sink homeward, returning to the root.
The return to the root is peace.
Peace: to accept what must be, and to know what endures.
In that knowledge is wisdom.