There is a certain sequence of states (spiritual degrees) that a created being has to undergo experientially, comprehensively, and consciously. At each degree, a greater desire with all of its properties, individual desires, and forces gets revealed to a person. In this manner, a person starts attaining the spiritual world, the Creator, by constructing Him within oneself.
But first of all, on our part, there has to be a desire. Otherwise, how can we feel all of this? The Creator cannot give us the good that we do not want, or we will feel very bad! If the Light gets revealed without the desire for it, it feels as horrific darkness.
Night is not lack of light, but rather the greatest Light, GAR de-Hochma. But we are seeing the “back” of it, its “reverse side,” since it has come, but we don’t have a vessel for it. This is why we feel so terrible. And come to think of it, why do we? Aren’t we given pleasure? But if we don’t want it, this pleasure is worse than any pain for us.
This midnight Light (darkness) descends to us from adhesion (Zivug) of Aba ve Ima that prepare Kelim (vessels) for the dawning day. First, a spiritual degree, all its 10 Sefirot, has to unfold in full, after which we take its small part and work with it all “day” long. But the “night” is a revelation of the enormous Light.
Therefore, we need to pass through all of these states: day and night, evening and morning, in order to obtain a desire thanks to which we will be able to enjoy. And this is not a desire to receive, but a desire to bestow.
From the 4th part of the Daily Kabbalah Lesson 1/25/2011, “The Essence of the Wisdom of Kabbalah”