Answer: It is because our upper root is the Creator, the One who bestows, who gives, who extracts from Himself and radiates the Light, while the created being is a desire, emptiness, that wants to receive the Light and be filled by it. These two elements are what all of creation is made of, the Creator and the created being.
Therefore, in our world we are the outcomes of these two spiritual roots—the Creator and the created being. In our world a man is like the earthly embodiment of the Creator and the woman is the embodiment of the created being. But this is only a conditional differentiation in our world; we shouldn’t pay attention to it—both men and women need to attain complete equivalence of form with the Creator, and they will attain it internally in the form of the full interconnection between them.
From the Kabbalah Lesson in Russian 6/26/16