in the unconscious we know many things that we do not know that we know. These could be called unthought thoughts or unconscious a priori knowledge.
Stein explicitly names ‘unthought thoughts’ as Jung’s term for unconscious a priori knowledge, providing the closest Jungian parallel to Bollas’s ‘unthought known’ and grounding the concept in Jung’s epistemology of the unconscious.
, Jung’s Map of the Soul: An Introduction, 1998thesis