A man walking along the sidewalk suddenly slips and mourns over his own death since he sees his shadow being run over by a truck. This is surely a case of mistaken identity. In our case too, the Seer (Self) and the seen (body) seem to have become one. We think 'I am the body' and consequently we suffer.
Through Drg Drsya Viveka, Adi Sankaracharya helps us ascertain 'who we are' and guides us in meditation so that we can realise our true nature of unconditional Bliss and end all sorrows for all time.
Pujya Guruji Swami Tejomayananda's commentary makes this process a vivid and joyful experience.