There is a special program in the upper Light that acts on the desire to enjoy created simply as starting material, completely lifeless like plasticine or clay. The very process of development by the four phases and the force ensuring this development are incorporated within the Light.
Namely, the Light creates desire “from absence.” The Light contains everything. It is the force of bestowal which develops the desire to enjoy thanks to its ability to give it more and more, both in quantity and quality.
The Light, that affects desire, creates new needs in it all the time. Phase 2 (Bet) becomes separated from Phase 1 (Aleph) precisely because it feels a lack. After the Light fills it, a void suddenly opens in it, and it understands that this fulfillment brings it nothing.
It thinks: “What happened? I have been flooded with the Light of Hochma (Wisdom), but do I feel fulfillment? No, I feel completely empty.” “But aren’t you full of the Light of Hochma?” “No, I don’t feel it.”
Phase Aleph seems to be saying: “What kind of fulfillment is this? This isn’t fulfillment, but emptiness! I want something else. I want to be filled with the Light of Hassadim (Mercy). You brought me a gift that You wanted, but I wanted something completely different. This is not what I asked for.” (Many, perhaps, have heard this from their wives.)
Essentially, the Light that fills the creature empties it for a higher degree. The Light satisfies desire at level 1, but because of it, the desire feels emptiness. Only the Light can perform such tricks. I wish we could learn such techniques for raising children.
From the 3rd part of the Daily Kabbalah Lesson 5/30/2011, Talmud Eser Sefirot