Pneuma could never do the imagination’s realistic job, as psyché did. For pneuma leads too quickly to the non-imaginative and rationalistic nous. Spirit, in this fashion, like the German Geist and the French esprit, ‘had come to mean rational, intellectual, ideological’
Miller, drawing on Hillman and Heidegger, argues that pneuma’s drift toward nous and rationalistic spirit disqualifies it from performing the imaginal, depth-seeking work that properly belongs to psyche.
, Achelous and the Butterfly: Toward an Archetypal Psychology of Humor, 1973thesis