153. He asks: earth is called Arka, when it should read, Ar’a. He answers: because Arka is one of the seven lands below, where the sons of Cain’s sons reside. Indeed, after being banished from the face of the earth, they descended there and fathered generations; wisdom became so lost that all understanding was lost, and this is a double land, consisting of darkness and Light.
Each of the seven Sefirot (the six Sefirot of ZA and Malchut) contain the properties of the other six. Thus, each one of them contains the seven Sefirot HGT NHYM. In other words, Malchut, too, has seven Sefirot, and the lower world contains seven lands, as well, called Eretz, Adama, Arka, Gia, Neshia, Tzia and Tevel.
Our land is called Tevel and is the highest of the seven lands. Arka is the third of the seven lands. The souls of Cain and Abel descend from the word Elokim, but due to the impurity that Chava (Eve), Adam’s wife, received from the serpent, the soul of Cain emerged first from the letters ELEH, followed by the soul of Abel, which emerged from the letters MI. These two Partzufim were meant to unite and incorporate their properties in one another, which would make the name Elokim shine in both of them, as when MI is permanently present in ELEH. However, the impure force that emerged together with Cain’s soul incited him against his brother (MI of the word Elokim) to the point that he rose against Abel (MI in Elokim) and slew him. This is because the disappearance of the property of MI-Bina from ELEH is tantamount to murder.
Without the support of the properties of MI, ELEH (Cain’s own property) fell into the impure forces: from the spiritual level of the holy land to the impure place (of egoistic desires). And he lost his descendants (Partzufim filled with Light) because of the rule of the impure forces (the disappearance of the screen).
Thus, the holy language within him was substituted for translation, for he had lost the wisdom (Ohr Hochma). After all, the impure forces lack wisdom, as they have only the Light of HB without Daat.
The slaying of Abel, i.e., the exit of Light from this Partzuf (item 152), occurs because MI is formed in ZON exclusively by the power of MAN (raised by the pure thoughts of the righteous in the worlds of BYA). Then appear the letters ELEH, and the word Elokim becomes as complete in ZON as it is in AVI. Malchut ends just like ZA, like Ima, due to the replacing of the letter Hey with Yod (item 17).
However, the letter Hey does not disappear from MA forever. Rather, it simply enters the inner part of Malchut and hides there (the will to receive receives its fulfillment from altruistic actions, from Ohr Hassadim. Hence, its egoistic aspirations are temporarily unfelt, as they are concealed in Ohr Hassadim). Meanwhile, the letter Yod is revealed in MI.
This is why the Creator’s holy name Elokim is also found in ZON, in Heaven and earth. However, Cain raised MAN not in holiness and purity, but wished to use the letters ELEH – which relate to him – for his own pleasure. This is described as, AND CAIN ROSE UP AGAINST ABEL, HIS BROTHER, for he put himself above his brother, to rule over MI (Abel).
However, AHP of Nukva (the hitherto concealed letter Hey of MA) were immediately revealed, and the word MI disappeared from Malchut. Hence, Abel’s soul, which stems from MI of Nukva (MI fill the Partzuf with Light and are considered its soul) ascends and disappears as well, as is described by the words, AND SLEW HIM, for the Light’s exit from the Partzuf is referred to as death.
This is why The Zohar describes this process in the following way: The serpent’s impure force was within Cain (Beresheet, 2:4); hence, he wished to strengthen the letters ELEH, annul MI, and govern them. That is why he revealed AHP of Nukva (MA) and MI disappeared from Nukva, whereupon Abel’s soul, which descends from MI, disappeared as well (AND SLEW HIM).
Thus, Cain himself (ELEH) fell under the rule of the impure forces, called Arka or Eretz Nod, as it is written in the Torah: “And he settled in the land of Nod” (Beresheet,4:16).
The Zohar calls it a double land, one that contains both Light and darkness. This is because Light and darkness mix and act (rule) together, as there are two rulers in that land, who divide the power equally between them. One rules over darkness, the other over Light. Hence, in this state one is unable to separate Light from darkness, and only help from Above, the descending Light of reason, enables one to tell between the true Ruler and the lord of darkness.