The Book of Zohar includes many parts:
1. Introduction of the book itself, which is also written by Rabbi Shimon,
2. The weekly chapters or commentaries on the weekly portions of the Torah,
3. The parts commenting on the Prophets (Nevi’im) and the Writings (Ketuvim).
The Book of Zohar was a complete commentary on the Hebrew Scriptures (TaNaKh for the Torah, Nevi’im, Ketuvim). We were left with only a part of this exalted Book, and most likely a very small one since except for the commentaries on the Torah, none other seem to exist. Moreover, as Baal HaSulam repeatedly emphasizes, the Torah commentaries are also missing a lot. We’ve seen how in some places, the text often ends quite abruptly.
But from the upper governance’s point of view it looks like we need exactly the parts of The Zohar that we have received. So, there is no need to feel bad that the whole Book of Zohar has not been found. We should be grateful for what we have of it and use it according to its purpose.
Now we are reading "Introduction of The Book of Zohar." All of the articles in this introduction are very useful and profound. But “The Donkey Driver,” “The Night of the Bride,” and “The Letters of Rav Hamnuna Saba” are the most fundamental articles where the authors of The Book of Zohar explain the basics of creation.
From the 2nd part of the Daily Kabbalah Lesson 1/9/2011, “Introduction of The Book of Zohar,” Article “Yitro (Jethro)”