Shiva is the supreme consciousness, called par brahma. He is not bounded by worldly bonds and he is above all powers of this world. Nirvana Shatkam is written by Adi Shankar Acharya. This Stotra describes that our body and material desires are very subtle part of our whole existence. Nirvana Shatkam is about separation and de-attachment or Vairagya of a Devotee.