archetypes are experienced as 'numinous' — to borrow Rudolf Otto's (1917) term — possessing awesome power and energy, as when the God archetype is activated. Thus the archetype is 'a dynamism which makes itself felt in the numinosity and fascinating power of the archetypal image'
This passage makes the canonical Jungian case that numinosity is the experiential signature of activated archetypal energy, citing Jung directly to anchor the claim in Otto's theology of the holy.
, The Handbook of Jungian Psychology: Theory, Practice and Applications, 2006thesis