It is a bit of a logics conundrum for me, I admit. But I would say that the Michaels or Creator Sons don’t actually modify personality patterns themselves, but rather modify their creatures to accommodate them. I think responsibility for personality bestowals, and if there is such a thing as modification of personality pattern, would fall solely upon the First Source and Center.
What seems more likely to me is that life forms are created or planned for personality patterns of a certain type. And since the Creator Son is the pattern for all the personalities in his universe, his creative powers would be specific for that pattern type. For instance, I’m wondering if the Nebadon type personality pattern actually gets it’s specific character more from its physical and mental components, which are created by the Creator Son and Creative Spirit of our universe. Whatever the specific personality pattern is, it would then be better suited to unify those components which were specifically created for it. In the quote below about Urantia type personalities, it mentions a Nebadon type of organism and a Nebadon order of the Orvonton series of cosmic mind, but I can’t find a reference to a Nebadon personality pattern type, but that would be the Nebadon Creator Son’s own personality, I think.
16:8.15 The Urantia type of human personality may be viewed as functioning in a physical mechanism consisting of the planetary modification of the Nebadon type of organism belonging to the electrochemical order of life activation and endowed with the Nebadon order of the Orvonton series of the cosmic mind of parental reproductive pattern. . . .
Then there’s this quote which makes me think I’m close to being right because Havona is a pattern for more than just personality:
14:6.27 5. The Co-ordinate Creator Sons. Havona is the educational training ground where the Paradise Michaels are prepared for their subsequent adventures in universe creation. This divine and perfect creation is a pattern for every Creator Son. He strives to make his own universe eventually attain to these Paradise-Havona levels of perfection.
But that doesn’t solve the problem of these two quotes from the section on The Purpose of the Central Universe:
14:6.28A Creator Son uses the creatures of Havona as personality-pattern possibilities for his own mortal children and spirit beings. The Michael and other Paradise Sons view Paradise and Havona as the divine destiny of the children of time.
14:6.37 7. The Evolutionary Mortals of the Ascending Career. Havona is the home of the pattern personality of every mortal type and the home of all superhuman personalities of mortal association who are not native to the creations of time.
The Havona citizens are perfect personalities. We mortals, when we arrive there, will be perfected personalities. Perhaps what they mean is that we will find our existentially perfect personality counterpart on Havona and be able to appreciate our own experientially perfected personality in contrast – actually complement one another. Don’t know.
Here’s another thought. If a Creator Son is conceived from the union of a specific absolute spiritual identity with a specific absolute personality concept, then the Creator Son’s personality and creative nature are bound together around a singular combination of a perfect idea and a perfect ideal. Everything that this Creator Son then creates will have his hereditary markings, which go all the way back to Paradise. Those pattern personalities on Havona which serve as possibilities would be those who share some feature of the perfect idea and/or perfect ideal which gave rise to his own existence. Not sure if I worded that clearly enough. Still thinking.
