All the wisdoms in the world are included in the wisdom of Kabbalah.
Baal HaSulam, “The Freedom”
Where the wisdom of researches ends, the wisdom of Kabbalah begins.
Rabbi Nachman of Breslev, Talks with Moharan p 225
The greatest wonder about this wisdom is the integration in it: all the elements of the vast reality are incorporated in it, until they come into a single thing—the Almighty, and all of them together.
Baal HaSulam, “The Teaching of the Kabbalah and Its Essence”
There is no other wisdom in the world where matters are so fused and intertwined by way of cause and effect, primary and consequential, as is the wisdom of Kabbalah, connected head to toe just like a long chain. Therefore, upon the temporary loss of but a small cognizance, the entire wisdom darkens before our eyes, for all its issues are tied to one another very strongly, literally fusing into one.
Baal HaSulam, “The Essence of the Wisdom of Kabbalah”
As the emergence of the living species in this world and the conduct of their lives are a wondrous wisdom, the appearance of the Divine Abundance in the world, the degrees and the conduct of their actions unite to create a wondrous wisdom, far more than the science of physics. This is so because physics is mere knowledge of the arrangements of a particular kind existing in a particular world. It is unique to its subject, and no other wisdom is included in it.
This is not so with the wisdom of truth, since it is knowledge of the whole of the still, vegetative, animate, and speaking in all the worlds with all their instances and conducts, as they were included in the Creator’s Thought, that is, in the purpose. For this reason, all the teachings in the world, from the least of them unto the greatest of them, are wondrously included in it, as it equalizes all the different teachings, the most different and the most remote from one another, as the east from the west. It makes them all equal, meaning the orders of each teaching are compelled to come by its ways.
Baal HaSulam, “The Essence of the Wisdom of Kabbalah”
The inner wisdom, in which there is no deceit, and whose merit is above all other teachings, is the wisdom of truth, the wisdom of Kabbalah.
Rabbi Shimon Bar Tzemach Doran, Rashbatz,
The Book of Rashbatz, part 2, Item 52
Since the whole of the wisdom of Kabbalah speaks of the revelation of the Creator, naturally, there is none more successful teaching for its task.
Baal HaSulam, “The Teaching of the Kabbalah and Its Essence”
Understanding the meaning of the word, "spirituality," has nothing to do with philosophy. This is because how can they discuss something that they have never seen or felt? What do their rudiments stand on?
If there is any definition that can tell spiritual from corporeal, it belongs only to those who have attained a spiritual thing and felt it. These are the genuine Kabbalists; thus, it is the wisdom of Kabbalah that we need.
Baal HaSulam, “The Wisdom of Kabbalah and Philosophy”
They have no scientific solution as to how a spiritual object can have any contact with physical atoms to bring them into any kind of motion. All their wisdom and delving did not help them find a bridge on which to cross that wide and deep crevice that spreads between the spiritual entity and the corporeal atom. Thus, science has gained nothing from all these metaphysical methods.
To move a step forward in a scientific manner here, all we need is the wisdom of Kabbalah. This is because all the teachings in the world are included in the wisdom of Kabbalah.
Baal HaSulam, “The Freedom”