Hello stemmian
actually if i read in the hadis of hadis rasulullah SAW, al quran this is one strength.
if the audience is left with the Qur'an means that the audience has lost power, both the forces of the world and the grave later, if in our lives diligent with the Qur'an, always reading the Qur'an and memorizing the Qur'an, we will be happy world and the here after.