Answer: A certain influence descends to us from the upper root (the thought of creation) from Above downward through all the worlds and finally reaches the final point, this world. It includes the exterior and the interior parts: the five upper worlds and the created beings.
The entire universe is worlds and souls which exist inside the worlds. The wisdom of Kabbalah examines everything except for the actual root: how it spreads from Above downward and then returns from below upward, which all happens in relation to the person attaining it.
At this moment, I exist in the reality of this world, and I perceive everything through the five senses: vision, hearing, taste, smell, and touch. They help me reveal and perceive whatever happens outside of me, but I do not know what is actually happening there.
Physicists say that we are being influenced by waves and that nothing but waves exist. Chemists say that these are reactions between certain substances, molecules. However, what matters is that I perceive certain influences and react to them. This is my inner perception, and others could react in a different manner.
We are all people, and we all operate the same way. For this reason, we kind of perceive the same things. Another being would feel a different reality. Every being perceives the world according to his properties, character, and informational genes. People, animals, insects, plants, and even rocks perceive themselves and their environment in different ways.
However, Kabbalah only speaks of the way humans perceive the world. Although there are differences even here, we still have a certain common perception. We still kind of understand one another. Our impressions coincide so much on the still, vegetative, and animate levels that we are completely at one with them.
The difficulties in perception only begin on the human degree where psychology, individual characteristics, perceptions, and sensations begin. If we examine solely the influence on the five senses which has not yet been deformed by the factors of psychological perception, then everything we perceive in them is referred to as the perception of this world, so far without your nerves and thoughts layered upon it.
When we attain the entire five spiritual worlds this way, this is called the wisdom of Kabbalah: the entire descent from Above downward, from beginning to end and back from the end to the beginning, all the objectives and systems, causes and consequences, everything until the very last detail. Thus, Kabbalah explains who man is, his purpose, the reasons for the need to descend from Above downward, and what awaits us at the end of the ascent.
This wisdom incorporates everything. It incorporates physics, chemistry, and a person’s life in this world. Everything is inside there. Kabbalah is the revelation of the entire reality inside the person attaining it.
Man ascends through the spiritual worlds and attains the reality in one of its sections: the first, second, third degree, and so forth. When he ascends to the next degree, it becomes clear that all the previous degrees are included in this degree.
From the 4th part of the Daily Kabbalah Lesson 1/23/2011, “The Essence of the Wisdom of Kabbalah”