rather than this being because of his work directly, it's more because he understood and lived the idea that change is inevitable and necessary
he only wrote one book his entire life
publishing edits through the years
it is amazing to see how the poems both change and remain the same over time
when i read a whitman piece i always read it as i know he himself would have:
how can i make this more beautiful and inclusive?
http://whitmanarchive.org/