Answer: The world of Atzilut is called the world of correction because it appears right after the shattering.
Therefore it is built so that no more mistakes can be made. It already has the experience of the shattering. It has witnessed that and is the remnant of the shattered parts. This is the reason that it builds itself so that the shattering will not be repeated and so the Light of GAR of Hochma is blocked. The world of Atzilut doesn’t allow the Light of GAR of Hochma to shine unto the lower because it was the reason they were shattered. They cannot receive such a great Light in order to bestow until the end of correction.
It is impossible to annul the desire to receive on the fourth level and to overcome the heart of stone. We have no power to overcome our ego now. But even if we take all the power we can from the Light, we still would not be able to receive the power that can overcome the stony heart. There is no such power in the world. Because it was created something from nothing.
And so in the light of no force that could fix it “nothing.” But precisely because we have something very own, cut off from the world, we are able to exist and be independent. This is a very important point.
The heart of stone was purposely created this way so that we would be separate from the Creator. Our “Luz bone,” our foundation, was created from absolute nothing, and this is the reason that there is no power in the Light to correct the nothing. But precisely because we have something of our own that is independent of the Light, we can exist and be independent. This is a very important discernment.
From the 2nd part of the Daily Kabbalah Lesson 2/13/14, The Book of Zohar