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The great scanned and often with OCR tombs of long-dead Authors in the sea of the Internet is a vast treasure. And with a bit of work one can often cast a large and free or almost free net in it.
The one thing we try so hard to share or teach is not what to believe or not or even what we may believe. But how to find out what others believed (why they believed it) that were so much closer to the past then we will ever be.
Yes, one must ring out the Religious views and powers of the times an the lives of each Author (and the Patrons that allowed them to be) that you study. Yet still, they either did the translations, saw the translations and long-lost records, manuscripts, cravings of those they studied, knew and learned the oral histories from those around them.
And in truth, almost all known history is built on these pre-20th-century Authors and their sources and at the very roots of all that is Published today, no matter what the current in vogue spin is applied.
Perhaps you like I have noticed with sadness how most modern Authors show their references to be other modern authors works often not even a score of years older than their regurgitations.
So seldom does one find an Author calling on the Authority of the oldest publicly available works and translations, where they are not polyglots of the ancient tongues and can read the earliest sources if they still even exist?
So I say when you find a written (claimed) factoid about ancient Druidical things. Keep digging and tracing that factoid back to its earlest true source. Then judge it with care and in the best light, you can find of how the societies, technologies, sciences, and beliefs would have functioned and ever more important how these ancient people would have interpreted the even far more ancient tales and histories they had.
TDK