Introduction to Sulam Commentary 78

עח. וכשיוצאים אלו המוחין בפעם הראשונה, נעשית מחלוקת בין ימין לשמאל (כמו שנתבאר לעיל אות כ"ט ול' באורך). כי קו השמאל, שהוא הנושא להארת החכמה, רוצה לבטל את קו הימין שהוא הנושא לאור החסדים. ומטעם המחלוקת והביטוש הזה דימין ושמאל הנוהג במוחין אלו, הם נקראים 'מוחין דאחור'. והנה נתבארו שלש הבחינות: עיבור, יניקה, מוחין דאחור. 78. When these brains emerge for the first time, a dispute arises between the right and the left (as explained at length in sections 29 – 30, above). For the left line, which is the bearer of the illumination of the light of Ḥokhma, wants to negate the right line, which is the bearer of the illumination of the light of giving. Due to this dispute, and this beating of right and left against each other, which occurs in these brains, they are called “the brains of the back.”²⁴³As in the previous section , when discussing the dynamics of conflict and harmony between different aspects of the system, the author of the Sulam refers to positions of “face-to-face” and “ back-to-back.” Since these brains are in conflict (as explained more fully in sections 29 – 30 as well as in the surrounding sections there), they are called “brains of the back,” with the right and left failing to work in harmony to provide illumination to the lower level. The three aspects, gestation, infancy and the brains of the back, have now been explained.