But I wanted to offer a short list of things off the top of my head which would be in the universal set of knowables but not in the subset of knowables by empiricism: standards/normatives, hopes/plans, stories/music/art, qualia (love, hate, pain, pleasure, etc.) and most importantly, Spiritual knowledge.
There are of course things which are both unknown and unknowable. betty boop mentioned noumenons - very important - what a thing is in itself.
To that I would add particles and fields which have no direct or indirect measurable effect and the full number and types of dimensions.
I'll try to catch up tomorrow.
Thank you so very much, dearest sister in Christ, for your marvelous insights!
Jeepers, I know you're busy. I hope and pray all is well with your elderly cousin.
When you are at leisure, I hope we can continue to explore these ideas....