There is a verse that says:
Guru Brahma, Guru Vishnu
Guru Devo Maheshvarah
Guru Shakshat Param Brahma
Tasmai Shri Guruave Namaha
GURU DEV
Guru Devo Maheshvarah
Guru Shakshat Param Brahma
Tasmai Shri Guruave Namaha
The meaning of this Verse is: The Guru is the Creator, the Protector and the Destroyer of ignorance. Being Param Brahma and being the incarnation of God manifested through the Guru, the Guru helps each one until one reaches the Self, until one reaches the inner Guru.
Sri Swami Vishwananda