So be very careful. You may not have faith in the words of Guru; you may not believe him when he says that the holy name is non-different from Lord Krsna. Sati was not convinced when Lord Siva, who was her guru as well as her husband, said, “Oh, He is the Supreme Personality of Godhead.” She thus committed such a serious offense that she had to give up her body as a result.
We must very deeply pay attention to the words of sri gurudeva. If one neglects his words, one is bound to commit an offense. For that kind of person, gurudeva is always silent. He will not say anything to a person who neglects his words. One may hear so many good instructions, but if he has no faith in the words of guru, he will commit offenses. Whenever someone disrespects guru and Vaisnavas, or sees some fault in them, he is actually reflecting the impure feelings of his own eyes and heart onto the Vaisnavas. In reality, guru, Vaisnavas, saints and Lord Siva do not have any faults. To show this again and again, these examples from history are given.
by Srila Gurudeva
Mathura, India: 1994