Introduction to Sulam Commentary

51. The purpose of the second aspect of the ascent of the feminine waters of Ze’er Anpin is to unite the two lines, right and left, in Yisrael Sabba and Tevuna (as stated in section 35 above). When the left line of Yisrael Sabba and Tevuna emerges, a conflict arises between the right and left on account of which neither of them illuminate until Ze’er Anpin unites them together, through the mystical meaning of the middle line, at which point they both illuminate (as explained there).