The Zohar, Chapter “VaYikra (The Lord Called),” Item 16: But now, after the Vav illuminated, meaning the middle line, when all four lights in the letters Yod–Kof–Reish–Aleph were opened, he [Moses] could come to the tent of meeting.
Only in the middle line can one enter the tent of meeting (Malchut) and pass the Lights into these desires (Kelim) through the three lines. This points to the main principle: One can receive the Light only by repelling it from oneself. If the Light of Hassadim, the Reflected Light, rises from the screen from below upward, we can receive the Light of Hochma into it.
In other words, if I desire to fill another person, and I give everything that goes through me to him (I push everything away from myself), then all the Lights can go through me, and I too will receive them. However, this will already be reception from below upward, with the help of a screen, which is in opposition to my ego. Then, as it is written, “Moses could come to the tent of meeting.”
If we wait for the Lights to be revealed in our desires, this will be for the sake of reception, and the revelation of the Lights will not be permitted. Therefore, the condition for receiving the Lights is “love your neighbor as yourself.” Everything can pass through you if you act for the sake of the neighbor. Then you delight by receiving both what comes to you and with what you fill the whole Malchut of Infinity. All these Lights are yours. This is the only way to receive them.
Herein lies the wisdom of receiving – the science of Kabbalah, a science about how to receive the Light by reflecting it. We are now situated in the Light of Infinity as well; it is present here and now. However, we do not see or feel it since first we have to acquire an ability to repel it, to arm ourselves with the Light of Hassadim. Only then will the Light of Hochma be revealed in the Light of Hassadim.
From the Evening Zohar Lesson 5/5/10