Perhaps I didn't express myself clearly enough. I sometimes say 'metaphysics' as a substitute for 'a philosophical worldview', thus an understanding of the nature of reality. I probably shouldn't do this, but sometimes I forget.

Regarding your second paragraph, both may be true. If our true nature is the soul, or atman as the Hindus say, then at that level we may contain all knowledge. So the more we are able to connect with that, by raising our vibrational level, the more we connect with that knowledge. Alternatively, as you say, we as humans may access that library, by meditation or the use of psychedelics, for example.