Joseph Dan says that Kabbalah can be considered:
a. The essence of Assyrian religion (!?).
b. The essence of Christianity.
c. Mysticism. A form of mysticism.
d. A secret magical tradition.
“Mysticism” is completely absent from both Jewish and Islamic cultures until the 19th century. The concept of mysticism derives from Christianity, referring to the mystical way of life, prayer and devotion that leads to a mystical union with God.
Traditional definitions of the term describe “mysticism” as the aspiration and sometime achievement of a direct, experiential relationship with God. One characteristic of mysticism is the denial of language’s ability to express religious truth. “In mysticism, language is apophatic, a “language of unsaying,” language that denies its own communicative message.” Religion can be communicated using words. Mysticism cannot.
Kabbalah is Jewish. Sufism is Islamic. Christianity was allegedly the original form of mysticism. And yet, “the concept of ancient tradition that permeates the kabbalah, and the sack that early Islamic Sufis wore, which probably gave them this appellation, have no parallel in Christian mysticism.”
–Joseph Dan, Kabbalah: A Very Short Introduction, 2006. Ppg. 8-10.