All comes out of HaVaYaH (Yod-Hey-Vav-Hey), the universal, singularly existing system, and everything takes its beginning in the root, the tip of the letter “Yod.” This is Keter, the “essence of the essence” (Yesh mi Yesh). There is the, “existence from absence” (Yesh mi Ain), which are expanding together. The Light affects the desire, and it takes various forms; that is, the will to receive constantly changes its properties in similarity with the Light.
The Zohar explains how all properties come from the Light which created the will to receive, “existence from absence,” and how the Light works on it. This is truly a symphony of development: the impact of the Light on the desire, the lack of filling that changes under the influence of the Light and acquires different forms and properties, including the properties of the Light and its own previous forms that influence the next states even several steps ahead.
The Zohar explains to us how from only two forces – the will to bestow and the will to receive – come all the diversity of the creature. And all of it is directly connected with us since in our world there is also nothing, except the two forces: black and white, one and zero, good and bad. It doesn’t matter what levels we are talking about – all of creation, all of our impressions, sensual images and pictures of the perception of reality – all of this consists of two forces.
The Kabbalists were able to describe these two forces beautifully in the form of letters. As a result, when we look at these shapes, they come alive and get filled with the spirit of life. You begin to recognize inside each letter: How these properties, the Creator and the creature, are connected with each other; how they are mutually intertwined and penetrate each other, in which direction, in what way; where they merge together and where they don’t yet, and what restrictions there are.
We don’t have the words to express these relations. But a letter, a symbol, gives you a model. And then, by absorbing this model, you enclose within yourself the entire accumulation of feelings, relations, and everything that exists within the letter. But a letter contains everything. It only seems a simple form, but this simplicity encloses thousands of previous forms that it was acquiring during its descent from above downwards.
In Kabbalah, everything derives from the vital necessity. By observing nature, the content of man and his perception, the Kabbalists saw that there was no other way to express the connection between the Creator and the creature except with the help of such symbols, these letters.
From the 1st part of the Daily Kabbalah Lesson 5/23/10, The Zohar