Hashem’s Name י-ה-ו-ה when each of those four letters is spelled out fully is read: יוד -הא-ואו-הא. If you add the numerical value of the above 10 letters, it adds up to 45, which is מ"ה. The word מ"ה means “what,” as in the phrase “ונחנו מה-and what are we significant?” This represents “ביטול”- the feeling of one’s ego being completely insignificant relative to one’s source, which is Hashem.
This ability of self-transcendence before Hashem is due to a revelation of Hashem’s most inner and essential Light, connected to other meaning of מה, which is מהות-essence. Because Yaakov was connected to this level of מ"ה, he was able to affect “Tikkun-fixing” to the breakdown which creates the possibility of unholiness, called “the Breakdown of the System of Tohu,” as will be further discussed in the maamar.
These Lights of Tohu were very great and were unable to become integrated into the limitations of the system of Tohu, so they left the limitations of that system, and these lights are called Encompassing Lights, and the fragmented remains of that system “fell down” below to this world.
The Analogy for This
A person has a conscious mind and emotions, and a subconscious mind and emotions. On the subconscious level, a person has unlimited potential for wisdom, and unlimited potential for all emotions. What would happen if all of a person’s subconscious potential would be revealed in his conscious mind and emotions, all at the same time? He would have a complete system overload. His conscious self wouldn’t be able to handle the intensity of the wisdom and the feelings flowing in him at the same time. He would have a total breakdown. So instead of becoming a genius or a brave hero, he would simply go crazy, not being able to handle or control himself.
Similarly, the “Lights of Tohu” represent the unlimited power of Hashem’s revelation. Unlimited Wisdom, unlimited Kindness, etc. However, when these limitless aspects became revealed, the “System” of Tohu was unable to process them functionally, and so the entire “system” of Tohu collapsed and became fragmented. From the fragmentation and chaos of that World, comes the chaos and fragmentation that exists in our physical world.
Therefore, Eisav in this world was wicked, but the ultimate root of his soul was in the Encompassing Lights of Tohu, which are superior to the Lights of Tikkun.
Eisav, who was chaotic and fragmented, was connected to the level of Tohu. Since the Lights of Tohu are unlimited, that is why he had so much power (that he ended up using for bad things).
The idea of Tikkun is to use the Inner Essential Light of Hashem to “fix up” the chaos and fragmentation of the broken system. This is possible because allows the Light of Hashem to become integrated into the system according to the limitations of the system. This is like how the conscious mind filters out the limitless potential of the subconscious and allows only enough revelation of soul-powers that can be integrated in a functional manner. From the perspective of Tikkun, the system is just as important as the Light, and therefore the Light needs to adapt to the limitations of the system.
However, because Tikkun takes into account the limitations of the system, the Light it allows is inherently limited. That is why there is still an advantage in the Lights of Tohu, since they have a limitless potential and power.
Because Yaakov was on the level of Tikkun and Eisav was on the level of Tohu, they needed each other. Eisav needed Yaakov to “fix” his chaos and guide him so that his great power and potential should become integrated into a functional system, i.e., to be used out properly for good and holy things. And Yaakov needed Eisav so that in his limited system he should become connected to the unlimited power of the Lights of Tohu. I.e., he should have tremendous boost of energy and passion in all aspects of his service of Hashem, so he can accomplish incomparably more.
Now, Yaakov thought that Eisav had already been refined and had returned to his soul’s exalted root in the Encompassing Lights of Tohu, which precede Tikkun.
