My Answer: The clearest and strongest sign of advancement in reading The Book of Zohar is the feeling of a greater need for connection with others.
Another sign is that I feel that The Zohar attracts me for some reason. Sometimes it draws me more and sometimes less, but no matter what, I feel good being near this book, whether reading or listening to it. I feel that there is power in this book that connects me with life. It has this effect.
Even if a person does not understand or attain what The Book of Zohar describes, he still feels that this book is like a rope or a life-line that the Creator has thrown to his creatures here in this world, as Baal HaSulam writes in his article “A Speech in Celebration of the Conclusion ofThe Zohar.”
By gripping the end of this rope, we can ascend to Him.