Baal HaSulam, “Introduction to the Book, Panim Meirot uMasbirot,” Item 12: You find that this goal is still denied from the perspective of the Partzufim of Kedusha (Countenances of Holiness). This is because there is nothing there of the vacant space, which is the complete form of reception, over which was the Tzimtzum, hence, no correction will apply to it, as it does not exist in reality.
Also, there is certainly no correction here from the perspective of the Sitra Achra, although it does have a vacant space, since it has a completely opposite interest, and everything it receives dies.
Hence, it is only a human in this world that we need. In infancy, he is sustained and supported by the Sitra Achra, inheriting the Kelim of the vacant space from it. When he grows, he connects to the structure of Kedusha through the power of Torah and Mitzvot to bestow contentment upon his Maker.
There has to be an adaptor that takes the desires from one place to another. This adaptor is called Adam (a human being) who is once incorporated in the system of the Sitra Achra receiving desires from it and once incorporated in the system of Holiness. Thus he moves from the system of impurity to the system of Holiness, until he accumulates the two systems inside him.
There is the pure and the impure system of the worlds about which it is said: “God has made them one opposite the other,” and a person is between these two systems. A person himself has nothing. It is only the middle part of Sefira Tifferet, which is absolutely neutral, an angel. Once it is incorporated in the system of impurity and takes desires from it, then it moves to the system of Holiness and corrects them. Then he moves to the system of impurity again and takes new desires, again moves to the system of Holiness and corrects them.
Thus he continues until he transfers all the desires from one system to the other. It is like the example Rabash gives when the doctor forbade him to drink whiskey and so he used to dip a piece of cake in whiskey and eat it until the glass of whiskey was empty, and then he would say: “I don’t drink whiskey, I eat cake.”
This is how we transfer desires from one place to another and this is all our work. Of course, we need to learn how to do that, how to summon the Light that Reforms, and accumulate the need for it, being nourished by the system of impurity. This is the way the system operates.
Let’s hope it will be clear to us that we only have to correct ourselves and bring the world to the perfect form when these two polar systems cease to be opposite one another and become one.
From the 4th part of the Daily Kabbalah Lesson 3/23/14, Writings of Baal HaSulam