Mercury Dreaming Saturn

I'm swift. No one can catch me.
No one really wants to try.
They chuckle when I fly by.
They shake their heads and mutter,
Yes, sure, but have you ever
Done anything durable?
They prefer Saturn, dreaming

Of me eluding his grip,
Chewing his cud, his children.
Oh, Saturn, he knows story,
That mason of chiseled lines.
He can turn out a novel,
An epic, slowly, slowly.
What can I do but escape?