"I bow to him the Sadguru who is the embodiment of the bliss of Brahman, the bestower of Supreme happiness, the absolute, and the personification of pure knowledge, who is beyond duality (as pleasure and pain). He is all pervasive like the sky. He is the final goal of the Vedic dictum "Thou art that!" He is one eternal. Pure, Steadfast and the witness of all thoughts, abiding ever beyond all modifications of mind and body and attributes of the three gunas - Raja, tama and sattva (all the three qualities of passion, ignorance and excellence).
Sadgurus or Perfect masters are in reality, the seers who have realized the Absolute or have reached the highest realm of spiritual attainment, are present for ever in the whole universe whether in an embodied or in an un-embodied state. They can operate in gross, subtle, or mental world. They have been actually chosen to execute the Divine Mission and for that, free from individual ego, work together for the execution of the Divine Mission.
A Sadguru is the one who leads the created to the creator. Their actions are universal in nature cutting across religions, nations and all divisions of society. In fact the descent of the Divine in human form is to create conditions for the human to ascend to his Divine essence. Everything that happens is but the expression of the Divine Will and the descent of the Divine energy and the ascent of the human aspiration are mutually complementary.
Jagat Guru, the preceptor of the Universe Shri Krishna has made it abundantly clear in Bhagavad Gita (IV. 7-8), that "Whenever there is decline in righteousness and rise in unrighteousness, O Bharata, then I send forth Myself. For the protection of the good and the destruction of the evil and the establishment of righteousness, I come into being from age to age".
Shri Krishna recommended, we should approach the wise Teacher "Learn THAT (Eternal Truth, the Brahman) by humble reverence, by inquiry and by service. The men of wisdom who have seen the Truth will instruct you in that wisdom".
Sadgurus are infinite existence, infinite knowledge and infinite bliss.
The form of Guru is the root of meditation,
The feet of the Guru are the root of worship,
The teaching of the Guru is the root of all hymns and
The Grace of the Guru is the root of salvation.