medieval-religion: Scholarly discussions of medieval religion and culture

Greetings all,
I´ve run across a passage referring to the visions of Hildegard of Bingen,  which states that while many wondered whether they were from God or 'de inaquositate aeriorum spirituum, qui multos seducant'.
(from Vita S. Hildegardis, ed. Klaes, p. 28)
This was translated as 'from the drying out of airy spirits, who mislead many.'
My question: airy spirits misleading people is not a problem, but I´m intrigued by the 'drying out' part.
How is dryness related to false visions?
Meg
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