“Preface to the Sulam Commentary,” Item 31, 32: …The right line keeps to the Hassadim, and wishes to cancel the Ohr Hochma in the left line, and ordain the Ohr Hassadim alone. Conversely, the left line, which keeps to Ohr Hochma, wishes to cancel the Ohr Hassadim in the right line and ordain only the Ohr Hochma. Because of this dispute, neither of them shines, since the Ohr Hassadim in the right line is deficient of Ohr Hochma, like a Guf without a Rosh, and the Ohr Hochma in the left line is complete darkness because Ohr Hochma cannot shine without Hassadim.
And there is no correction to this dispute except through the middle line, created by the lower one that ascends there for MAN, in the form of the middle line. A Zivug from the Upper Light is made… and it compels the left line to unite with the right line.
The two lines, left and right, are prepared for us from Above, but the middle line is for us to prepare. We raise our request (MAN) for the screen, and thereby achieve correction: The left and right lines come together, complementing each other, and reach a compromise. It has to do with one’s freedom of choice. A person connects into the existing mechanical system of the left and right lines, and begets a new quality that did not exist before: the desire to be similar to the Creator.
I use faith above reason, the desire that is totally independent of anything that may happen. I don’t worry about the left or right line, neither about Hassadim, nor Hochma; my only goal is to unite with the Creator. For this reason I do not perceive it as a compromise (one line cannot annul itself before the other), but only as a means to attain unity. This is why a compromise is possible.
It’s similar to approaching two people having a furious argument and being unprepared to change their opinions even slightly. However, I have no intention to unite and reconcile them. I have a more exalted goal: to attain something higher. Yet, I do this by using the power of both these lines.
I set a goal that is above all: to make myself similar to the Creator and merge with Him. In this case the two lines can merge and complement each other because they feel perfection in relation to this goal. Each of them does not attain what it desires; however, its involvement in attaining this goal calms it down.
The middle line shines for them. It is small compared to them, but it attains the Creator’s perfection. This is a higher perfection than what they could attain on their own because this perfection comes from merging with the Creator.
From the 2nd Part of the Daily Kabbalah Lesson 5/30/20, “Preface to the Sulam Commentary”