The Zohar, Chapter “Shemot (Exodus),” Item 177: In the Garden of Eden on the earth, everyone stands in the shape and form in which they were in this world. [A spiritual step at which a person stays at any given moment is called “this world.”] And this concealment and secret is given to sages. The spirit that descends to people, which is from the side of the female, is always carved in an engraving such as this seal, whose letters are sunken. This is so because the image of the body in this world is protruding outwards and the spirit is carved into its internals. When the spirit spreads from the Guf [body] and rises to the Garden of Eden on the earth, that spirit protrudes in the Garden of Eden on the earth in the shape and image of the actual Guf in this world, since it is always as a seal.
“The body” (desire) and the “spirit” (Light that fills the desire) match each other like a seal and its imprint. They separated in order to reconnect. The wisdom of Kabbalah teaches us how to make them match. It’s called “Kabbalah” (receiving) because we are the ones who organize and control the entrance of the Light into the desire, defining the shape of the Light’s entrance into desires and their filling.
For that reason, we study the nature of Light and the nature of desire for their nature is unknown to us beforehand. We have to connect with Light and desire, receive an accurate form of Light and desire, and “tune” them to each other so that one can enter the other. The result is called the “science of receiving the Light” which is the science of Kabbalah.
From the 1st part of the Daily Kabbalah Lesson 4/15/10, The Zohar