Avraham’s served Hashem through the aspect of Kindness, which is how Hashem’s Light flows down to the lower levels. This is how he was able to bring down his Lofty Wisdom to Malchus, Thus, “travelling from the south” means “serving Hashem in a way of Kindness. “Until Beis E-l” means that this flow of Light in a manner of Kindness reaches all the way to Malchus, to how Hashem is manifest in the actual world.
And, in addition, he spiritually traveled from below-to-Above, from “Hashem who appeared to me...” until “to Hashem” without any description. The Mittler Rebbe in Toras Chaim explains this: After Avraham received the power to elevate the Sparks of Holiness from all the things in the physical world that he was involved in, he had to elevate those Sparks back up to his original level. Corresponding to this process, he built two altars: One to “Hashem who appeared to me...,” which corresponds to the level of Malchus, this is the source of revelation in the created worlds. The second to “Hashem” without any descprition, which is to a more hidden level of Hashem’s Sefiros, which is the level of Ze’eir Anpin, which is higher than being directly invested in creation. Once these Sparks became included in Ze’eir Anpin, they are able to be further elevated to the level of the Lofty Wisdom, which is Avraham’s original level.
So far, the maamar answered the questions it asked at the beginning:
Q1- What is the meaning of Avram’s journey from Above to Below?
A1- This means that he brought the Lofty Wisdom of Hashem on a journey down to Malchus of Atzilus, and into the physical world, to be able to refine and elevate the Sparks of Holiness trapped in the physical world.
Q2- What is the meaning of the journey from Below to Above?
A2- This means that he was to bring those Sparks of Holiness on journey upwards to Atzilus, and from Malchus of Atzilus up to Chochma of Atzilus.
