Question: If it is impossible to comprehend what Kabbalists talk about until one enters the spiritual world and sees the roots, then why are you trying to explain everything "more clearly" to us?
Answer: I attempt to awaken in you the desire to reach spiritual attainment, and then you will understand what I was relating. Baal HaSulam writes about it in the article "The Essence of the Wisdom of Kabbalah":
And once he has thoroughly attained the upper roots with his own mind, he may examine the tangible branches in this world and know how each branch relates to its root in the upper world, in all its orders, in quantity and quality.
When one knows and thoroughly comprehends all that, there is a common language between him and his teacher, namely the Language of the Branches. Using it, the Kabbalist sage may convey the studies in the wisdom, conducted in the upper, spiritual worlds….
However, when a disciple is not wise and comprehends the language on his own, meaning how the branches indicate to their roots, naturally, the teacher cannot convey even a single word of this spiritual wisdom, much less negotiate with him in the scrutiny of the wisdom. This is so because they have no common language they can use, and they become like mute.
In Kabbalah, "forbidden" means "impossible." In our world certain actions are prohibited because if one wants to, he can nonetheless do even what’s forbidden. But such behavior can only occur "in the fall of man" and below it. In the spiritual world, if something is forbidden, it means that it’s absolutely impossible to do it.
From the 4th part of the Daily Kabbalah Lesson 2/14/2011, “The Essence of the Wisdom of Kabbalah”