Through the story of Kisa Gotami, what did the Buddha try to preach to the common man?

Through the story of Kisa Gotami, what did the Buddha try to preach to the common man?

Answer

Death is common to all – Kisa’s only son died – could not accept – asked for help – approached Buddha – asked her to procure handful of mustard seeds – condition – should bring seeds from a house where no one has ever died – could not find any such house – disappointed – watched city lights flickering – realised that death is inevitable.