The Creator in defined by the concept of “One,” as it is said: “One, Unique, and Unified.” This is how He reveals Himself to us. When Kabbalists attain the Light of Infinity, the highest point we can possibly attain, they discover One concept that includes everything without any differences.
In the beginning everything was included into this single concept: all the created beings as one creation. Afterwards, in order to give the created beings a feeling of existence, understanding, and attainment of who they are and who the Creator is and to make them appreciate the complete and eternal state in which they exist, this single concept was divided into numerous individual concepts that are opposite to Him.
This is how the descent from the world of Infinity up to this world occurs, according to the rungs of the ladder, through the five worlds (Adam Kadmon, Atzilut, Beria, Yetzira, and Assiya). Within them, a huge number of changes take place. This descent of the worlds goes on until it reaches our world in which we are completely detached from perfection and even from the feeling of the lack thereof.
But it is especially due to this that we begin to attain unity, the One. It is due to our efforts to correct our view point of the world, our perception of reality through our five senses and above them, as much as we can imagine it to ourselves, and to connect everything to the single One.
We have no other work: only to connect everything together into One concept. Each one connects his perception of the world to One, and everyone connects their perceptions together so that everything merges into One. And this work is applied primarily in the group, with the help of the efforts of the many who want to determine the concept of this One above all the differences between them.
From the 1st part of the Daily Kabbalah Lesson 11/27/2011, Shamati #69