devotion advances and gets refined to many a higher level 
from physical to mental to subtle mental 

and disappears as nothing, in the state of non-doing, no more any devotion
the stream flows to become river, river flooding and merging into ocean 

similarly

duty in the beginning is work, labor physical, 
then man gets promoted to do exercise intellectual

he grows to become supervisor, manager, delegates 
becomes ceo, becomes owner, relaxes, himself, relegates

he just enjoys he plays, he does nothing , everything happens, as per his whispers 
he disappears, to outside the country, to unknown places

none knows where when how what of his affairs
yet he commands all the errands, all the company affairs

he is the supreme master of the universe
his duty now is doing nothing , things go as per his wish