The impermanence of the world means that everything is changing. Without something that will never change, something that will never change will not exist.
Example:
1. In a changeable world, lies are people's refuge.
2, things are different, I like your sentence: I would like to be a comma, always stay at your feet.
The beauty of words is not that they can resist the impermanence of the world, but that there is a moment when we are willing to believe that they can.