Scientific knowledge versus spiritual knowledge

[Neo-Scholastic]

The thought problem raises the question as to whether there are facts about which someone can have knowledge that cannot be reduced to purely physical processes. Mary learns something. Of what does she learn? How does an independent observer confirm what she has learned?

By comparing what she reports to what others report, of course. It's not that difficult. You're overthinking it.

Exactly, which undermines the point of Brian37. Intersubjective results are still subjective experiences for the individuals having them. Radical empiricism of the type Brian37 advocates isn't truly objective in the way that he demands for it to count as knowledge.