"The object of the theoretical (as separate from the practical) Qabalah, insofar as this thesis is concerned, is to enable the student to do three main things: First, to analyze every idea in terms of the Tree of Life. Second, to trace a necessary connection and relation between every and any class of ideas by referring them to this standard of comparison. Third, to translate any unknown system of symbolism into terms of any known one by its means."
January 1, 1970
https://en.wikiquote.org/wiki/Jewish_symbolism