the ‘malign spirit’ was called Aquilo, the north wind. Its coldness meant the ‘frigidity of sinners.’ … The north wind comes from the region of fire and, despite its coldness, is a ‘ventus urens’ (burning wind)
Jung marshals medieval theological sources to demonstrate that the North Wind is a paradoxical symbol: the embodiment of demonic coldness and spiritual frigidity that nonetheless originates in fire, encoding an archetypal coincidentia oppositorum within the shadow.
, Aion: Researches into the Phenomenology of the Self, 1951thesis