A sisya, a disciple, comes to the guru for enlightenment. Everyone is born foolish. Everyone. Even the human beings, because they are coming from the animal kingdom by evolution, so the birth is the same, ignorance, like animals. Therefore, even though one is human being, he requires education. The animal cannot take education, but a human being can take education.
Lecture on Bhagavad-gita 2.9, London, August 15, 1973