Sisyphus was a king who believed he was more clever than the Greek god Zeus. As punishment for his arrogance, Sisyphus was made to roll a boulder up a steep hill. Every time he approached the summit he would lose his grip and the stone would roll back to the bottom.
Revising my work is for me the modern version of the myth. I work hard to make the sentences crisp, eliminate excess words and advance the plot. Later I read the revision. I see more ways to improve, clarify and entertain.
I don't think the job will end until the work is published or banished to a drawer. Such is the writer's curse.