3. Even though we count ten sefirot, they constitute no more than five levels, which are called Keter, Ḥokhma, Bina, Tiferet, and Malkhut. The characteristics of the sefirot are fully explained in Petiḥa LeḤokhmat HaKabbala (Introduction to the Wisdom of the Kabbala), from the beginning until section 7. It is advisable to see the detailed discussion there. Consequently, there is no need to repeat that lengthy exposition here, even though that work contains the foundation of the wisdom of Kabbala and so is worthy of study.