Baal HaSulam, Beit Shaar HaKavanot (The Gate of Intentions), Chapter “Concerning Passover Exodus”: On the Passover night, Zeir Anpin grows to the greatest state, and hence, on this night, such enormous Light is revealed that it is greater than the Light of Sabbath.
All that there is in Zeir Anpin of the world of Atzilut is passed down to the souls. If we here, below, don’t ask and don’t evoke ZA, it remains in its constant small state, VAK, whereas Malchut is just a point. When there is only the Light of VAK in ZA, Hassadim (Mercy), Malchut has nothing since she has receiving desires and cannot be filled with only the Light of Hassadim.
Therefore, this is a preparatory state that has nothing to do with any spiritual action yet. All the other states are defined by how high ZA can rise (upon our request) over the small state.
The process we undergo during the exodus from Egypt, from being enslaved by the desires located below the Parsa, is not simple and doesn’t correspond to the usual work order: six “weekdays” followed by the seventh “day,” Saturday. Saturday is arranged “in likeness to the future world,” and, according to the spiritual work performed during the six “business days,” brings us the “awakening from Above” and its result: corrected desires.
However, the exodus from Egypt is a “night,” not a day as Saturday is. It’s a sign that a very big Light of Hochma (Wisdom) is revealed that is not covered by the Light of Hassadim. Hence, it feels not as Light, but as “Egyptian night,” the enormous Light of Hochma that cannot emanate to us.
We are constantly present within an ocean of Light, and we are either unable to establish any relationship with it (and then we simply don’t feel it, as right now), or we can approach the Light and obtain exactly the same property as it has. Then, according to the law of equivalence of form, we will be able to feel it. If I am in the same bestowal as the Light, then between us, a common sensation appears that is regarded as the revelation of the Light, the Creator, to the created beings.
Alternatively, there can be an opposite state where I don’t feel that I am approaching the Light, bestowal, but on the contrary, I feel coming closer to reception, my opposition to unification. This doesn’t pertain to mere material gain, but specifically to the lack of unity of the souls that makes me feel darkness. This has a spiritual meaning.
We always deal with what lies above the animate level, meaning with the internal work that bears a “positive” or “negative” fruit, and a person senses transformations as either an unfolding Light or darkness. However, in the worst case, a person feels nothing whatsoever, which means he is not working at all. The essence of the Passover story is an unusual order (Seder) of receiving the Lights that wake us up and lead out of Egypt.
From the 3rd part of the Daily Kabbalah Lesson 4/21/2011, Beit Shaar HaKavanot
Passover Seder: The Order Of The Birth Of The World Soul
Salvation Will Come In A Blink Of The Eye