Why Is The Soul Made Of Ten Sefirot?

Question: Why is the soul made of or does it have to be made of ten Sefirot?

Answer: Because according to the physical spreading of the Light unto the desire, there cannot be a complete action if the Light does not go through the ten Sefirot and does not attain the last tenth Sefira, the tenth.

In it the Light finds the desire that is right for it, which means the right attribute that catches the Light and receives it inside.
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From the Kabbalah Lesson in Russian 3/5/17