We take certain things for granted. In this example, consider the river. Any river, but think of it. It has a name. You can call it by its name, and others will know what you’re talking about.
At the same time, the river is just a pathway through which running water flows. The water that makes up the river is never the same water. Ever. Once the water passes along its way, it moves elsewhere. The river is called by a name, but that name will always fail to describe the river.
Isn’t it possible that everything, and every one, is like that river?