The criteria upon which we base our discrimination are the standards set by guru, sadhu and sastra. We are conditioned and therefore not yet able to hear from supersoul directly. We must learn to use our intelligence to disciminate on the basis of what we have heard from these three sources. We must come to understand the spiritual master's instructions along with the instructions of the sastra and sadhus. We should not place our faith in the mind but in these three authorities.
LFD Vol 1, What is real criterion for making proper decisions in our conditioned position?, Pg 66, last paragraph.