The Zohar: The Creator said to Noah: “Enter the ark with your entire household.” One of man’s qualities, which he defines as the Creator, turns to another quality in him called Noah. Noah is the quality of bestowal and love, and the aspiration to rise above one’s ego. One’s quality called the Creator speaks to this quality, called Noah, in order to elevate it even higher. This is why the Creator says: “Enter the ark!” which means – fortify yourself in the quality of bestowal.
It is written of the entrance into the ark: “The Creator (HaVaYaH), Zeir Anpin, said,” and it is written about the exit: “Elokim said,” referring to Nukvah of Zeir Anpin. It is written that the master of the house, Zeir Anpin, allows Noah to enter the ark. The ark is the quality of bestowal, Bina. If a person (the quality of Noah that aspires toward bestowal) enters the ark, Bina, then he feels that nothing can harm him – he is safe from all of his other qualities, which disagree with Noah. All the rest of man’s qualities are egoistic and can harm his spiritual progress; this is why he wants to separate the quality of Noah from them and advance only with this quality. He leaves the other qualities alone for now and makes a restriction on them, hiding them away.
Then the mistress, Nukvah of Zeir Anpin, tells him to exit. He entered with the permission of the master, Zeir Anpin, but exited with the permission of the mistress, Nukvah of Zeir Anpin. This is talking about two forces that influence a person: the force of Zeir Anpin and the force of Nukvah, judgment and mercy. By influencing us with these two reins, we advance closer to the goal.
Thus we have found out that the master brought the guest into the house, and the mistress led him out of it, as it is written. “Elokim said to Noah: Come out of the ark!” Elokim is the masculine force, the force that overcomes. She is permitted to bring the guest out, but she does not have the right to let him in.
Even though these two forces are opposite to one another, they act together in order to advance us. We cannot advance with just the help of the one force that pulls us forward. We also need the force that pushes us from behind. We are always being controlled by them as if by two reins. If we understand that these two forces are influencing us for our own good and balance the left force with the right one, then we will connect them together and build the middle line.