Srila sanatana gosvami writes in his digdarsini-tika, "in this verse it is found that it is possible to attain the results of directly offering a lamp on ekadasi. This history of the mouse is very famous in the padma purana, kartika mahatmya. (in a temple of lord visnu, there was a mouse living who was eating the ghee from the extinguished ghee lamps which had been offered by others to him. one day when she felt hungry to eat ghee, she tried to eat the ghee from a lamp which was not yet extinguished. while eating ghee from the lamp, the cotton wick got stuck in her teeth. since the ghee wick had a flame, the mouse started jumping in front of the lord's deity form and thus died due to fire. but lord sri visnu accepted the jumping of that mouse with a lit ghee wick in her mouth as his aratik. in the end he gave her liberation, the topmost destination.)
mathurayam narair urje snatva damodaro'rcitah
krsna rupa hi te jneya na atra karya vicarana
Any person who worships lord damodara in the month of karttika in the mathura area, certainly achieves the same form as lord sri krsna himself.
srila sanatana gosvami comments on this in his digdarsini-tika, "human beings achieving the same form as krsna means that they see lord sri krsna. in other words, they become as worshipable as lord sri krsna. This is the understanding here."