“So śāstra-cakṣusā. Everything we have to take from the śāstra. Because we are blind now. Śāstra-cakṣusā. Our, the śāstra-jñāna, because the spiritual master enlightens the disciple with śāstra-jñāna, therefore he is spiritual master. If the spiritual master bluffs the disciple, then he is not spiritual master. Bluffing. No.
om ajñāna-timirāndhasya
jñānāñjana-śalākayā
cakṣur unmīlitaṁ yena
tasmai śrī-guruve namaḥ
(Śrī Guru-Praṇāma)
This is guru. Guru means he’ll always enlighten the disciples with the light of śāstra. Not that he will say, ‘There is no need of śāstra. I am incarnation. I, whatever I speak, you take it.’ No. This is rascal. You should immediately, who has no reference to the śāstra, immediately take him as a rascal number one. This is the conclusion.”
(Srila Prabhupada Lecture, London, July 20, 1973)