Malkuth is a very important Sephiroth, precisely because it is from this point where the initiate can ascend back to God. Malkuth serves as a storehouse of spiritual energies and principles. Much in the same way that circuitry needs grounding in order for electricity to flow, so do we need a physical body for alchemy in order to transmit and return the forces of Christ back to their source.
Those children unbaptized by the fire of the Holy Ghost within limbo, initiates of the minor mysteries, must undoubtedly return to a new physical body precisely for this reason, since it is from having a physical body that we can transmit the energies of the Lord back up the Tree of Life.
I remember many years ago, during a tough period of my life, when I questioned whether one needed a physical body to do the work, I was corrected by Samael Aun Weor within the astral plane that, "The earth stores many treasures yet undiscovered." He showed me caverns filled with gold, and I realized that this gold is precisely our philosophical gold, the spiritual principles of Christ latent within our semen. We need this material body in order to advance, since the treasures of god are within our psyche and our body. What is essential is to take advantage of our life for the good of the great cause: the Being-Partkdolg-Duty mentioned by Master Gurdjieff.
Joyful in hope, suffering in tribulation, be thou constant in thy prayer.
Benedictis, qui venit in nomine Domini. Osanna in excelsis.
"Blessed is he who comes in the name of the Lord. Hosanna in the highest!"