(italics mine)British Bardism was essentially founded in the verified Truth of experience. It considered nothing as settled until it had been sifted, tried and tested; until its truth had been established beyond all doubt, by patient research and exhaustive investigation. An old Greek sage has defined philosophy as the art of doubting well. So the Bards taught their disciples to “doubt everything they did not know!”
And this may be said to be the basis of all inquiry. “If a man will begin with certainties,” says Francis Bacon, “he shall end in doubts, but if he will be content to begin with doubts, he shall end in certainties.” So also taught the Ancient Bards of Britain. Bardism certainly indulged in all manner of speculations: it dreamed, it imagined, it wondered, it worshipped. But it dogmatized upon nothing but Truth. And this the Bards rigorously and at all costs held up “against the world” until the last vestige of their ancient institution has been temporarily crushed out of the land by powers and interests with which Truth is not compatible.
http://books.google.ca/books?id=yXQ1FqJ ... &q&f=false
I have no idea of the veracity of Mr. Evans research, but it "feels" right to me, and I still see "powers and interests with which Truth is not compatible" everywhere, including in modern druidry.