Question: How was The Book of Zohar written? Did its authors rely on some kind of source like the Torah, for example, or did they write everything only from their attainment?
Answer: The authors of The Book of Zohar had no library, computer, or connection to any information because the information itself was found within them; they were its source.
All ten people who wrote The Book of Zohar were one single spiritual body in which all the information that they described and partially expressed was found.
From the Kabbalah Lesson in Russian 2/5/17