Our 'true nature' is truly a mystery.
That we are the witness or knower, the eternal seer or consciousness etc. are reasonable ideas that may have some value.
But in a sense, these sort of descriptions are still a kind of transposition of the body-mind idea. They are limited by the logic of the body-mind modality. It's a bit like having a dream about living in a tiny cave and supposing that when you wake up... it will be in a spacious cave.
All explanations, understandings and descriptions, no matter how wonderful and convincing, are equally constructions appearing in an unborn that is by its very nature unable to be bound and limited by its own formations.
This unborn (and yes, calling it the 'unborn' is already saying too much) that is 'prior' to all constructions could be said to be analogous to dreaming in the sense that it cannot itself appear as an object in the dream.
Completely ungraspable and utterly mysterious...
Yet.......................