What Is a Desire?

Question: Why do we sometimes refer to desire as matter and another time as a force? Can matter be a force? Or does force clothe into matter?

Answer: Often times we refer to desire as matter because there is nothing other than desire. But the desire is inherent in the force (as much as it desires); that is why we also refer to it as a force.
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From the Kabbalah Lesson in Russian 3/19/17