Answer: When a person begins to study the wisdom of Kabbalah he feels the world external to him as the world inside him.
What seems to be on the outside is nothing but our internal attributes that are reflected to us on the outside. We see ourselves, our internal attributes, the parts of our internal system on the levels of the still, vegetative, and animate nature and man, as the world that is external to us.
This is evidenced in the wisdom of Kabbalah and also The Book of Zohar, a special book that was written 2,000 years ago, tells us all the secrets of nature. It says in the “Introduction to The Book of Zohar” that the world is depicted to us as being external to us, which is an illusion and that in fact it is inside us.
This is very difficult to perceive. The theory of relativity, which scientists are discovering today, describes the mutual integrality of the universe and that it is one-dimensional; this was already described by the wisdom of Kabbalah thousands of years ago.
From the Kabbalah Lesson in Russian 4/17/16