"And he blessed them that day"
The discussion begins with an interpretation of "And he blessed them that day." We are told that the phrase "that day" signifies the unity between Zeir Anpin and Binah. "By you" alludes to the unity of the blessings from both high and low grades. "Yisrael," we learn, is an allusion to Yisrael-Saba, who receives blessings from above and confers them on Malchut. The rabbis then explain why the name Ephraim is mentioned first in the verse, "Elohim make you as Ephraim and Menasheh." The first explanation of the title verse concludes with the teaching that love of one's grandchildren often surpasses the love of one's own children. This paragraph is difficult to follow without knowing the whole verse it refers to.
Rabbi Yosi provides an additional explanation for the verse, revealing that men are blessed first, since women are blessed only through the blessings of men.
In order for a lamp to illuminate a darkened room, it must be connected to a source of energy. Likewise, for spiritual Light to brighten our darkened world, we must connect ourselves to the source of energy that powers the entire cosmos. The word "that day" indicates a connection between Zeir Anpin and Binah, two Sfirot that occupy the Upper Worlds. The phrases "By you" and "Israel" correspond to the connection between our souls and the entire physical dimension to Zeir Anpin. Spiritual current is now free to flow and illuminate all of mankind once these cosmic "power stations" are connected to one another.