The Zohar, Chapter “Lech Lecha (Go Forth),” Item 22: Therefore, when Abraham… came and received the illumination of the left line, …he immediately fell under Nimrod’s rule. He, in turn, threw him into the furnace, which extends from the power of the illumination of Shuruk.This is when the Creator helped him extend the illumination of the middle line over the Masach de Hirik, which decides and makes peace between the two lines—right and left.
Salvation always lies in the middle line, the screen of Hirik (Masach de Hirik). Two forces – the left and right lines, the force of bestowal and the force of reception – must surface within us; with their help, we are being governed from Above. Similar to how these two forces descend from one upper root, so must we unify them in the middle line.
For this purpose, we are given the Wisdom of Kabbalah, a method that allows us to understand how to unify the two lines and remain in the middle one. However, in order to attain this wisdom, this knowledge, we need a group, studying, and dissemination. All these means help us visualize the correct state, desire it, and ask the Creator to grant it.
Obviously, this wisdom and understanding how to arrange these two forces in order to reconcile them in the middle line also come from Above. It is written: “Who makes peace in His heaven, makes peace within us.” “Who makes peace in His heaven” means the place from where the two lines derive. There too, the Creator extracts them from the middle line – Himself, Zeir Anpin in relation to us. Thus, the two lines descend down to us, to Malchut and all the souls residing within her.
“Makes peace within us” means that from Above, we are given the knowledge of how we have to arrange ourselves. And once we do, the middle line descends and enters us. This is our salvation that was given to Abraham as well.
From the 2nd part of the Daily Kabbalah Lesson 7/15/10, The Zohar