How did Buddha make Kisa Gotami realise the reality of death?

When Kisa’s only son had died, she went to Buddha. Being plunged into deep grief, first she went to every neighbour, asking for medicine for her dead son. She had lost all her senses and forgot that no medicine could bring back the dead. Then she went to Buddha for requesting to make his son alive. Buddha asked her to bring some mustard seeds from a house where no death had occurred. But she couldn’t find such a house. Buddha made her realise that death is common to all. So in the midst of adverse circumstances, we should not lament. He who seeks peace should draw out the arrow of lamentation, and complaint and grief. He who has drawn out the arrow and has become composed will obtain peace of mind, he who has overcome all sorrows will become free from sorrows, and be blessed.