This is a question I haven’t found any discussion of anywhere on this forum–or anywhere else. As a long-time UB reader and a big fan of the Guidestones since I found out about them a couple of years ago, I’m surprised that this is the case. I won’t go into much detail about the Guidestones since it is much simpler to point people to the Wikipedia page for them here, and for those interested in really getting into serious detail to the most authoritative writing about it is in a book titled “Common Sense Renewed“. It was authored by the same person who was the author of the writings on the Guidestones, the pseudonymous Robert C. Christian. You can find PDF files of the book scattered about the web, but since they are usually associated with blogs I don’t want to endorse I’ll leave the web search to those interested. Wired Magazine did a reasonably good article on the guidestones a while back.
The vast majority of other stuff about the guidestones on the web is by people who hate them. Given that the message of the ‘stones is at least broadly similar to the UB, I think that’s worth noting in itself.
For purposes of discussion here are the ten guiding principles inscribed on the stones.
- Maintain humanity under 500,000,000 in perpetual balance with nature.
- Guide reproduction wisely — improving fitness and diversity.
- Unite humanity with a living new language.
- Rule passion — faith — tradition — and all things with tempered reason.
- Protect people and nations with fair laws and just courts.
- Let all nations rule internally resolving external disputes in a world court.
- Avoid petty laws and useless officials.
- Balance personal rights with social duties.
- Prize truth — beauty — love — seeking harmony with the infinite.
- Be not a cancer on the earth — Leave room for nature — Leave room for nature.
And just to (I hope) help a little more in kickstarting further conversation, here’s my very general take on whether or not they are “Urantian”: I think that the general thrust of the guidelines is in keeping with the teachings of the UB, though on a level that could be considered more adjusted and qualified for the present situation. For example, the UB is obviously theistic to the core but the ‘stones only mention “seeking harmony with the infinite.” The UB advocates a planetary government much stronger than just a world court, though that would certainly be part of what the authors advocate and a plausible necessary first step.
The only place in which I can see the possibility of a concrete disjunct concerns the desired level of population for the planet. The guidestones clearly advocate staying under 500 million while the UB can reasonably be taken as being okay with the level circa 1935(but not much higher), just a little over two billion. The book does not prescribe a specific number, however, so it’s open to interpretation. Personally, I’m quite cool with 500 million. 
68:6.11 (770.8) From a world standpoint, overpopulation has never been a serious problem in the past, but if war is lessened and science increasingly controls human diseases, it may become a serious problem in the near future.
For any number of reasons I suspect that Robert C. Christian was a UB reader (though I can hardly prove it) but in the era between roughly 1900-1980 most of the views expressed on the stones were not so unusual in certain more progressive and spiritually-minded intellectual circles. As just one example, among more internationalist Rockefeller Republicans after WWII and until the extinction of the species around 1980, I don’t think that such ideas would have been all that uncommon, at least in private.
I do think the secrecy around the origins of the Georgia Guidestones has a qualitative “ring” to it much like the origins of the UB.
Would love to hear what others think.
