The Language of the Kabbalists Is a Language of Branches
All the words and utterances our lips pronounce cannot help us convey even a single word from the spiritual, Godly matters [properties of bestowal and love], above the imaginary time and space. Instead, there is a special language for these matters, being the Language of the Branches, indicating their relation to their Upper Roots.
However, this language, though extremely suitable for its task of delving into the studies of this wisdom, more than other languages, is only so if the listener is wise in his own right, meaning that he knows and understands the way the branches relate to their roots.
– Baal HaSulam, “The Essence of the Wisdom of Kabbalah”
All those who attained the Light of the Creator through their work wanted all those succeeding them to enjoy what they had already discovered, as well [reached the same level]. Therefore, they named each and every attainment so they [those who follow] would be able to understand their intentions and the attainments that they attained, and thus form a common language with each other.
– Writings of Rabash, Volume 2, Letter 19
Laitman.com Post: Kabbalists On The Language Of Kabbalah, Part 14
Laitman.com Post: Acquiring A Spiritual Dictionary
5 Minutes Of Light From The Daily Lesson: The Language Of Roots And Branches