Guru's duty is . . . a śiṣya, a disciple, comes to the guru for enlightenment. Everyone is born foolish. Everyone. Even the human being, because they are coming from the animal kingdom by evolution, so the birth is the same, ignorance, like animal. Therefore, even though one is human being, he requires education. The animal cannot take education, but a human being can take education.
Therefore śāstra says, nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān arhate vid-bhujāṁ ye (SB 5.5.1). I have several times recited this verse, that now . . . in the lower than human being condition, we have to work very hard simply for four necessities of life: eating, sleeping, mating and defending. Sense gratification. Main object is sense gratification. Therefore everyone has to work very hard. But in the human form of life, Kṛṣṇa gives us so much facilities, intelligence.