Byron Katie says that things come to pass, not to stay.
One way of understanding that is in the usual impermanence way, that the world of form is in flux. The world of form is flux. Things come and then pass. Whatever is within content of awareness is already gone as soon as we try to capture it. Whatever arises is always fresh, new, different. God does not repeat itself. (All of this, the whole appearance of flux and change, only arises within the realm of thoughts… memories, projections, ideas of continuity.)
Another way of understanding it is that things come in order to leave. Their reason for happening is to leave, so that we can see our attachments, our beliefs around it saying they should stay longer.
Expanding it a little, we can say that impermanence is an invitation for us to see each of our beliefs from many different angles. We get to see our beliefs that something should not happen even as it is. That things should go away even as they stay. That things should come even as they don’t. That things should stay even as they go away.
Impermanence is an invitation to notice and investigate those beliefs, revealing that which does not come and go, this awakeness that the world of form happens within, to and as.