Creation is an empty desire, while the Creator is the Light. How can the two opposites – the void and the Light – connect? If they don’t, the creature whose nature is a vacant desire, will remain empty forever. How can these two opposites be reconciled? After all, according to the law of equivalence of form that governs nature, they cannot draw together and merge just as the north and south poles cannot.
Hence, it appears necessary to mix the desire to receive and the desires to bestow. In the “head” (Rosh), an intention to receive in order to bestow arises, while in the “body” (Guf), there appears an egoistic force to receive not for the sake of bestowal, but for the sake of self. This is how the breaking between the “head” and the “body” occurs. There is a loss of connection between them along with the ability to think and act in unison. There is one thought in the “head,” but a completely different desire in the “body.” The heart and the mind are not one.
From the 4th part of the Daily Kabbalah Lesson 7/7/10, “Introduction to the Book, Panim Meirot uMasbirot”