Glorious Lord Shiva is the source of the light of the world

असतो मा सद्गमय
तमसो मा ज्योतिर्गमय
मृत्योर् मा अमृतं गमय
ॐ शांति शांति शांति - बृहदारण्यक उपनिषद् 1.3.28.

Lead Us From the Unreal To Real,
Lead Us From Darkness To Light,
Lead Us From Death To Immortality,
Aum (the universal sound of God)
Let There Be Peace Peace Peace. - sang the Upanishadic Rishi ..
(Brihadaranyaka Upanishad 1.3.28.)

Thus too, He who leads us fro Darkness to light , is the Guru.

Glorious Lord Shiva is the source of the light of the world. He is The Primal Guru. In Leading us to The Light, he leads us to Himself, in leading us to Himself, He leads us to our SELF.It is all one great Mystic , spiritual circle. It is all the Leela of Shivji and Shakti Ma.
(shail gulhati)