51:1.6

While living as permanent citizens on the system capitals, even when functioning on descending missions to the evolutionary planets, the Material Sons do not possess Thought Adjusters, but it is through these very services that they acquire experiential capacity for Adjuster indwellment and the Paradise ascension career. These unique and wonderfully useful beings are the connecting links between the spiritual and physical worlds. They are concentrated on the system headquarters, where they reproduce and carry on as material citizens of the realm, and whence they are dispatched to the evolutionary worlds.