Answer: This means that Adam established a connection between the upper root of every phenomenon and its outcome in our world, and gave names to all the objects according to their spiritual origin.
The book The Angel Raziel, which Adam wrote according to the alphabet he discovered, can be bought in any bookstore now. However, I doubt whether we will understand anything, because it is written from the precise perception of the upper management.
Twenty generations after Adam, another Kabbalist, Abraham, wrote the book Sefer Yetzira (Book of Creation), again, only by looking at the spiritual root, and his book also seems to be encoded, even though the language seems very clear. Then the descent of the generations began and the Kabbalists who followed Abraham, his students, began to write differently. They looked at the corporeal branches and not at the spiritual roots. Moses, for example, wrote the Torah according to the way it is depicted in our world.
All the generations are advancing toward a spiritual decent. On the one hand, we can say that Moses was on a lower spiritual level than Abraham, but on the other hand, he left us and did much more for us, because we can use his writings and through understanding their branches, we yearn for the roots. This means that Moses’ book is much more important for us than Adam’s book.
From the Kabbalah Lesson in Russian 7/17/16