Baal HaSulam, Shamati, article 33, “The Lots On Yom Kippurim and with Haman“: “This is so because he sees that without the contradictions, meaning the descents, there would not be a place for the Upper Light to be there, as there is no Light without a Kli (vessel).”
The Upper Light is actually perceived by the obstacles, the little potholes. If a wall is smooth, then we cannot hold on to it, but if there are holes, cracks, and pits, then it is possible to climb it.
Thus the Upper Light can be raised only according to our holes, and if the desire is too smooth, then it has nothing to hold onto. This is why changes are so essential in a person’s desire, both in the size and in the character of the desire, that he will feel disappointed and hurt but will not run away. Instead, he will stay and demand the greatness of the goal and feel that the Dinim (judgments) are revealed on top of the greatness of the goal.
The goal has to be clarified as much and as clearly as possible. The question is what a person yearns for: either the greatness of the vessel or the greatness of the Light. The most difficult thing for us is to think about delighting the Creator. It is because we then feel complete darkness, how detached we are from Him, and how we don’t feel Him.
These are very strong Dinim that are meant to reveal the Creator and so they are revealed as total detachment. It isn’t in our feelings or mind that we can tie ourselves with the desire to delight the Creator. It is easier to tie ourselves with all of humanity because we can understand and feel everything that relates to the vessel, but not to the Light.
Here I discover a real demand: “Where is He and how can I imagine Him?” Then the vessel begins to take on its form in the dark, reach the complete HaVaYaH, and receive the filling. As a result, a person begins to somewhat understand the idea of the Creator in order to attribute himself to Him and perhaps even think about the next level, about delighting Him.
From the 2nd part of the Daily Kabbalah Lesson 5/30/14, Shamati #33