On the spiritual degrees, the difference between opposites is much less bearable than in our world. After all, everything comes from the initial state, where the Creator, who is Good and Does Good, created egoism – the desire to receive pleasure, which is opposite to Him.
The Creator is inside this desire, which he manages. The desire to receive and the desire to bestow are outcomes of a single force, the Creator. We are incapable of withstanding the manifestation of these opposite desires from a single source until we reach Final Correction.
But when we do, we will see that these two opposites can be together, because then, in that point which was created as “something from nothing,” the material from which it was created – the absence of the Creator – becomes annihilated. This point then becomes completely bestowing, like Him.
This is why the existence of opposites is the reason for all of creation’s development until its final correction.
(From the Daily Kabbalah Lesson)