Answer: Because you cannot see anything.
Take me, for example, your teacher, you can look at me as much as like, but you will not see any greatness in me.
You will only see an old man who very much wants people to begin studying the wisdom of Kabbalah, not from his books but according to the original sources of Baal HaSulam and Rabash. You can take The Book of Zohar and the writings of the ARI, go ahead, but they are much more difficult and distant from us.
I am simply an expert, up to a certain level, of the method of getting closer to the Creator! A methodologist! And this is what I teach you.
The teacher’s greatness, just like the Creator’s greatness, depends on the student. The Creator is revealed to us only according to our feeling of His greatness. Why is He concealed? Because you don’t think highly of Him.
It is the same with the teacher, to the same degree. How do you know your teacher? You don’t know him. Therefore, everything depends on his greatness in your eyes. Only on that!
From the Kabbalah Lesson in Russian 8/7/16