This book tore me up a little bit, and I'm still working through it.
What it is, is a history of those who have self identified as Druids in Britain. He touches on the ancient sources, but the focus is on the 'modern' iteration of Druids, from about 1600 on.
My bedrock takeaway is that there may not have been Druids at all. Not in the way we think about them, as some traditional priesthood of the Celts. The Celts did not leave any written records. Very little of what is written about them from the ancient sources were in a position to actually know, and those guys were politicians. They had ulterior motives, to put it generously, as their main argument seemed to be 'these guys are terrible, therefore I should invade their country.' Weapons of mass destruction in Iraq, Iraqis throwing babies out of incubators, the Kaiser had his men bayonet whoever. Atrocities happen, but if you're hearing about it from a politician, look close at the source material. History teaches us to take that shit with a grain of salt.
So everything I've ever heard about Druids, good, bad and indifferent, says more about the people saying it and their critique of the society they were living in, than about anything ancient, anything Celtic. Use the Druids to stand in for the Church and either elevate them or critique them as needed. Create your own society that is mostly political, or philanthropic, and plop that name on there if it helps sell the cause. Use it to create your own religion that jettisons the baggage of the present for the baggage of a made up past. Are they savage headhunters or ancient patriots who would definitely be on the side of the modern nation-state? Well, depends on which one you need.
The scientists don't come across much better. Once modern archeology enters the scene they seem to be mired in the politics of the profession and roping off their piece of the pie as much as the Druids. A lot of, 'you are wrong, but here is my own totally made up take on Druids with just as much, or as little, actual evidence'.
So many of the, mostly, men who made Druidry today what it is were at least half con man. It takes that kind of hutzpah and charisma to buy into something like this and sell it to others.
I have practiced a version of this made up Keltica, psychology, nature study, the occult, masonic ritual and old New Thought philosophy. I've gotten a lot out of it. I will continue with my practices.
But as I get older I find there are fewer and fewer truths to cling to. People pass away and their lives make a ripple. No one will go back and painstakingly research any part of their lives. What looks new and shiny today, things, people, ideas, entertainments, will look old and stodgy to your grandchildren. Humanity will go on, unchanged. There is not progress, not the kind you see in the chart that moves from chimpanzee to upright human. We like to think it all just continues to improve and history shows us that isn't the case. Any progress we achieve has to do with an individual, however imperfect, making a correct choice and seeing it through. And whatever progress happens will be undone, sooner or later. Civilizations rise and fall, just as individuals do, and ours is no different, no better or worse. In a hundred years all those computer files and electronic clouds of date will be as accessible as all those books and records from the 1920's. All the blogs and youtube videos and kindle files and netflix shows will be nearly forgotten. There's a comfort in there somewhere. No matter where we are in history an individual making the best choice they have available can make a difference. It helps to be a bit of a megalomaniac huckster, apparently, but we already knew that, didn't we?
Still, we all make a difference to the people around us, and that's always the best place to start. It's just jarring to have the lack of solid ground pointed out in such painstaking detail.