Question: Why is it said that the Surrounding Light becomes a vessel (Kli) for receiving the upper Light? Isn’t this only a condition for working with the desire to receive pleasure?
Answer: It is not exactly so. In reality, the desire to receive pleasure has never absorbed the upper Light even before the restriction since it is not intended for receiving the Light. That is, it received the Light not because it aspired to do so, but because the Creator arranged it this way. Therefore, this was not called receiving.
The desire to receive pleasure will never be able to be filled with the Light because it is opposite to the Light. The law of equivalence of form has to be observed. Therefore, the only Kli for receiving the Light is the Reflected Light (Ohr Hozer), bestowal.
We exist because a tiny illumination penetrates our egoism despite the prohibition introduced by Tzimtzum Aleph (the first restriction). This illumination vitalizes our entire world. However, it is not called receiving since the Light momentarily disappears—this is stealing.
Even if I truly wanted to bestow to the Creator in response, my desire would still be too small. The Reflected Light expands it, increases it 620 times, and gives me the opportunity to receive through bestowal.
My desire is unable to reveal the greatness of the Creator without the screen and the Reflected Light; it is very small. Meanwhile, the Creator is Infinity. Therefore, by revealing His importance and greatness I become included in His Kli (desire) and thereby obtain an infinite ability to bestow. After all, I want to fill Him!
From the Daily Kabbalah Lesson 12/10/2011, Talmud Eser Sefirot