“Introduction of The Book of Zohar,” Article “The Fourth Commandment,” Item 212: It is written, “And let them be Me’orot [lights],” with the letters of Ohr [light] Mavet [death], since the Klipa follows the brain. The brain is light, and the other side is death….
When this light departs from there, the letters of separation, Mavet, unite. When not making the unification in the place of AVI, but in the place of ZON below, the light departs from there because AVI are promptly separated from their Zivug and the light stops. Then the word Ohr comes out of the word Me’orot and the letters of Mavet join. This is so because after the elicitation of the light from the word Me’orot, the word death remains there because the letters of Ohr have already departed from the word and they no longer separate the letters of Mavet.
This implies to the sin of that primordial serpent, which connected below in the place of ZON, and hence separated above for AVI because their Zivug stopped because of it and has brought death to the world.
From this we see how short the distance between life and death is, how instantly it turns life into death. Everything depends on whether or not a person discerns within himself the presence of the Creator. If the Creator is present and He is above, it is life, and if not, death.
From the 2nd part of the Daily Kabbalah Lesson 2/14/2011, “Introduction of The Book of Zohar”