If we want to become enlightened with that knowledge by which nescience is destroyed, we must carefully hear what is the distinction between reality and illusion from a bona fide spiritual master. If we hear from someone who does not know what he is talking about, we will be misled and thus not be successful in realizing the truth and escaping the cycle of birth and death.
How do we recognize who is the bona fide spiritual master? He must be repeating the Vedic conclusion which has been taught by all the great acharyas throughout history, and he must be fully absorbed in Krishna consciousness 24 hours a day. This method of discerning the bona fide spiritual master is confirmed as follows in the Mundaka Upanishad:
tad-vijnanartham sa gurum evabhigacchet
samit-panih srotriyam brahma-nistham
“In order to learn the transcendental science, one must approach the bona fide spiritual master in disciplic succession, who is fixed in Krishna consciousness.”