Kisa Gotami was sad because her only son had died. In her immense grief, she was unable to accept his death and carried his body from house to house, desperately seeking medicine that could bring him back to life.
In the end, she learned a profound lesson from the Buddha: death is universal and inevitable. By sending her to find mustard seeds from a house where no one had died, the Buddha made her realize that every family has experienced loss. She understood that sorrow and grieving cannot overcome death, and true peace can only be found by accepting this reality.