It says that a person should write the Torah on his heart. That is, a person discovers everything that we read about in the Torah (in The Book of Zohar) by being in that same system of connections between the souls, in his relation towards that system. He has to uncover the whole book of the Torah. Everything that is written in it is gradually, step by step, revealed to him.
Kabbalists describe this using several languages, in several ways, in order to convey to us all the levels of the full connection: the root level (Shoresh), the first (Aleph), second (Bet), third (Gimel), and fourth (Dalet) levels. But ultimately, they tell us how a Kabbalist, a person who attains spirituality, discovers this network of connection that ties him to the other souls, and how he returns to the correct connection with these souls: a connection of mutual guarantee. This is what The Book of Zohar writes about.
From the 2nd part of the Daily Kabbalah Lesson 12/25/2011, The Zohar