“A special quality that Allah, Most High, has placed between the teacher and the student is witnessed by anyone who interacts with knowledge and scholars. How often it happens that a student reads something in a book, memorises it, repeats it to himself, yet does not understand it.
Then, when his teacher reads it to him, he suddenly understands it and acquires knowledge of it by being present.
This understanding may come about through conventional means such as contextual indications or an explanation of the difficult point in a manner that never occurred to the mind of the student. It may arise not through any conventional means, but through something that Allah gifts the student with when he presents himself before his teacher in manifest indigence and plain need of what he is being instructed in.”
(al-Muwafaqat, ash-Shatibi,Volume 1 pg. 73)