My best guess is that psychedelics break down the normal duality of self and the other/self and the present time environment and that oneness is the mystical experience. To me the cosmos as it actually is, is in a flowing oneness state of grace within which random experiences of all kinds can still exist. To me epitemologically wisdom is the integrative process of truths and grace is its pinacle concept and experience. Grace is not perfection, its more perfect imperfection which allows us to learn and progress as beings. Also, if its a holographic cosmos, which I suspect it is, then pan-entheism would seem to be the truth.