Answer: Kabbalah is the foundation. It was established before any of the religions. All the texts and all the books that we read like: Psalms, Ecclesiastes, and so forth, are Kabbalistic texts, they have nothing to do with religion. They were written by Kabbalists. They wrote about attaining the upper world and about the higher system by investigating it within themselves based on the connection between them and others. This is high, practical, internal psychological work.
I do not see a single book that can be seen as a basis for humanity besides the wisdom of Kabbalah. Kabbalah was the source of scientific knowledge for scientists, philosophers, alchemists and many others throughout human history. They derived all knowledge from Kabbalah. It is a science.
As long as this wisdom existed among the people of Israel, both the Greeks and the Romans drew knowledge from it and then disseminated it even in Europe. When the people of Israel descended from their spiritual level from “And you shall love your friend as yourself” (Leviticus 19:18) to the level of “mutual hatred,” the wisdom of Kabbalah was hidden from the people and remained only among a small group of people. Since people became disconnected from the perception of the upper world, they themselves began to imagine it within completely different frameworks and attributes. And from this arose religion, Judaism and from that, Christianity and Islam. So we have become disconnected from spirituality in a 2,000 year exile; we have to explain that Abraham and Moses were Kabbalists and that the Talmud is a Kabbalistic book.
We cannot and should not prove anything to people because everything will gradually be revealed to humanity. People will suddenly begin to understand that the Kabbalistic ideas are correct. Humanity has been divided into many different levels according to their yearning to discover the truth. There are people who want to study the various sciences, to be involved with the arts, to achieve self-realization, etc. And there are people who just want to live normally, and for this religion is necessary for them. But there are people who want to accurately attain the meaning of life; they are the ones who come to the wisdom of Kabbalah.
From the Kabbalah Lesson in Russian 9/25/16