A student can receive spiritual knowledge from his teacher only to the extent that he strives to become like him. The spiritual knowledge then simply flows into him, like through adjacent vessels.
A famous law of physics states that if two vessels connect, then water flows from one vessel into another and rises to the same level irrespective of the vessel’s width. In spirituality, it happens irrespective of the soul’s initial capacity, which depends on its place in the system of Adam.
The teacher’s spiritual vessel may be enormously wide, while the student’s vessel may be very narrow (or the other way around), but if they unite, the student will receive the same fulfillment as the teacher. Everything depends on the height of the student’s connection to his teacher.