Baal HaSulam, by his corrections in the upper world, prepared it so that any person can achieve Dvekut (adhesion) with the Creator. Before him, one had to be an outstanding wise disciple to be rewarded with adhesion with the Creator. And before the Baal Shem Tov, one had to be among the greatest in the world. Otherwise, they would not be able to attain Godliness.
– Rabash, Steps of the Ladder, “The Deeds of the Nation’s Greatest”
The depth of wisdom in the holy Book of Zohar is enclosed and caged behind a thousand locks, and our human tongue too poor to provide us with sufficient, reliable expressions to interpret one thing in this book to its end. My Sulam commentary is a ladder to help the examiner rise to the height of the matters and examine the words of the book itself. Hence, I have found it necessary to prepare the reader and give him a route and an inlet in reliable definitions concerning how one should contemplate and study The Book of Zohar.
– Baal HaSulam, “Preface to the Book of Zohar,” Item 1