Guru Utsav 2.36

Guru is the God, say the scriptures. Indeed, the 'guru' in Vedic tradition is looked upon as one no less than a God. 'Guru' is a honorific designation of a preceptor as defined and explained variously in the scriptures and ancient literary works including epics. The English word 'guru' has its etymological origin in the Sanskrit term. The Concise Oxford Dictionary of Current English defines it as "Hindu spiritual teacher or head of religious sect; influential teacher; revered mentor".
More Real Than Gods:
Aren't gurus more real than the gods? Basically the guru is a spiritual teacher leading the disciple on the path of "god-realization". In essence, the guru is considered a respected person with saintly qualities who enlightens the mind of his disciple, an educator from whom one receives the initiatory mantra, and one who instructs in rituals and religious ceremonies. The Vishnu Smriti and Manu Smriti regards the Acharya (teacher), along with the mother and the father as the most venerable gurus of an individual. According to Deval Smriti there can be eleven kinds of gurus and according to Nama Chintamani ten. According to his functions he is categorized as rishi, acharyam, upadhya, kulapati or mantravetta.
The Guru's Role:
The Upanishads have profoundly underlined the role of the guru. Mundak Upanishad says to realize the supreme godhead holding samidha grass in his hands one should surrender himself before the guru who knows the secrets of Vedas . Kathopanishad too speaks of the guru as the preceptor who alone can guide the disciple on the spiritual path. Over time the guru's syllabus gradually enlarged incorporating more secular and temporal subjects related to human endeavor and intellect. Apart from usual spiritual works his sphere of instruction now included subjects like
Dhanurvidya (archery) , Arthashastra (economics) and even Natyashastra (dramatics) and Kamashastra (sexology). Such was the ingenuity of the all pervading intellect of the ancient Acharyas that they perpetuated even shastra like thievery. Shudraka's celebrated play Mricchakatikam tells the story of Acharya Kanakashakti who formulated the Chaurya Shastra, or the science of thievery, which was further developed by the gurus like Brahmanyadeva, Devavrata and Bhaskarnandin.