'Gu' stands for Gunatheeta (attributeless). 'Ru' signifies Rupavarjita (formless).The Sanskrit root "Gu" means darkness or ignorance. "Ru" denotes the remover of that darkness.Therefore one who removes darkness of our ignorance is a Guru. Only he who removes our ultimate darkness, known as Maya, and who inspires and guides us on to the path of God-realization is the true Guru). So, God, who is attributeless and formless, is the true Guru.
The full moon day in the Hindu month of Ashad (July-August) is observed as the auspicious day of Guru Purnima, a day sacred to the memory of the great sage Vyasa. All Hindus are indebted to this ancient saint who edited the four Vedas, wrote the 18 Puranas, the Mahabharata and the Srimad Bhagavata. Vyasa even taught Dattatreya, who is regarded as the Guru of Gurus.

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