The Zohar, Chapter “VaYechi (And Jacob Lived),” Item 210: Come and see how important are the works of the Holy King. In the deeds that are done below, they tie them with the high things above, in their root, since anything below in this world has its root above in the upper worlds. And when they are taken down and worked with, the act above awakens corresponding to them, in the roots in the upper worlds.
“Above” and “below” refer to Bina and Malchut. If we think that “Above” refers to some abstract place in spirituality while “below” alludes to a place in our world, that is incorrect. After all, the science of Kabbalah does not speak of our world whatsoever. It does not concern itself with man in our world or actions which we perform here. The science of Kabbalah alludes only to actions in the desire which we can perform in similarity to the Upper Force, in bestowal.
Therefore, “the work of the Creator” means to learn from Him how He performs actions and to perform the same actions in our desire. Herein lies our work. We study this and ask the Creator for the ability, the strength, and a model of how to do it (from NHY [Netzah, Hod, Yesod], AHP [Awzen, Hotem, Peh] of the Upper One in the lower one).
Our entire work is the connection between Malchut and Bina where Malchut wants to learn the qualities of bestowal from Bina and, in response, receive the strength and realize it so as to become similar to Bina. That is why Malchut is called the lower world and Bina is the Upper World. All the actions to correct Malchut (the creature or the souls) are made only in the World of Atzilut. The souls which wish to unite rise precisely into Malchut of the World of Atzilut.
Therefore, wherever The Zohar speaks of the lower and Upper worlds pertains to what takes place between Malchut and Bina of the World of Atzilut,