Main Kabbalistic Sources: Baal HaSulam’s Commentaries on the works of the ARI and The Book of Zohar
We can see that all the interpretations of The Book of Zohar before ours did not clarify as much as ten percent of the difficult places in The Zohar. And in the little they did clarify, their words are almost as abstruse as the words of The Zohar itself.
But in our generation we have been rewarded with the Sulam [Ladder] commentary, which is a complete interpretation of all the words of The Zohar. Moreover, not only does it not leave an unclear matter in the whole of The Zohar without interpreting it, but the clarifications are based on a straightforward analysis, which any intermediate student can understand. And since The Zohar appeared in our generation, it is a clear proof that we are already in the days of the Messiah [complete and general correction of humanity], at the outset of that generation upon which it was said, “for the earth [“Eretz,” derived from the word “Ratzon” or desire] shall be full of the knowledge of the Lord.”
– Baal HaSulam, “A Speech for the Completion of The Zohar”
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