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A reminder that Robert Graves is not a reliable source, and if you are relying on any books by him, including The White Goddess, to double check everything you incorporate into your practice!
ETA: If you're happy to include things like that anyway, the choice is (obviously) your own, and I don't mean to judge that :). Just to be aware that a lot of Robert Graves' theories are unfounded and based somewhat on poetic license.