Qabalah and the Law of One.

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To discover these connections you have to look at the Golden Dawn since they were the ones that first correlated the 22 Major Arcana with the 22 Paths of the Tree of Life. There are actually considered to be 32 Paths total on the Tree of Life since each Sephiroth is also considered its own path. This is where you see the common "32 Paths of Wisdom" documents. The Hebrew Letters were corresponded with the Paths before the Tarot ever was. Astrology is also very old but to note that most ancient systems utilized only 7 planets.