This is a very nice lecture given by Srila Prabhupada in Bombay April, 1976 and is a very good description of what is a guru. We have also included a link to the audio file so that you can listen to the lecture at the same time you are reading it. This is our first audio link that we have posted from this site, as an experiment.
In this lecture Srila Prabhupada begins “So the first training, how to create a brahmacari… This is human civilization…So we must come to the platform of varnasrama-dharma, not “Hindu dharma”. As he’s stated many times, the term “Hindu” is not a name that you find in the Vedas or in Sanskrit. Rather, it was a name given by the Muslims, who were referring to the people of the Indus region. The religion of the Vaisnavas is Sanatana-dharma, not Hinduism.
Also a very nice definition of what it means to be a guru is described; “A perfect guru is one who is speaking on behalf of Krsna – not on his own behalf.” “If you want to have a perfect guru, then you have to see whether he is speaking on behalf of Krsna or on his own behalf. One who speaks on his own behalf, manufactures, he is not guru. He’s a rascal. One who speaks on behalf of Krsna, he is guru.”
Class on the Srimad-Bhagavatam 7.12.02
Bombay, April 13, 1976
By His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
The Hare Krishna Movement 