Neshamah, Geburah relates to the Superior Emotional Center
Ruach Elohim, Chesed relates to the Intellectual Superior Center
Geburah and Chesed form our Inner Monad, our Innermost.
The throne of the Innermost is the Cerebral Spinal Nervous system, also called Central Nervous System.
Neshamah is like an alabaster vase, white and transparent; within there burns a steady golden fire, the flame of Prajna that radiates from Atman [the Ruach Elohim, the Innermost].
Allow us to asseverate along with H.P.B. that, indeed, occult anatomy teaches that the seven spinal chakras exist in the already mentioned places, and that these spinal chakras are controlled by the seven capital chakras of the brain.
We accept that the magnetic center of the physical heart is controlled by the esoteric heart situated in the region of the cerebral thalamus. Thus, any spinal chakra has its correspondent capital chakra in the brain. - Samael Aun Weor
Therefore the physical vehicles of Geburah and Gedulah are related to the fire of the seven churches which are in Assiah, the spinal medulla, and which are directly related to the seven capital chakras in our brain.
When an initiate reaches the first initiation of major mysteries he/she becomes united with their Monad through their superior emotional and intellectual centers located in the central nervous system, the throne of God.
The fire of the Divine Mother Kundalini rises along the spinal medulla to the brain to join Shiva in the pineal gland, in accordance with the merits of our heart, the emotional center.