On naturalism and consciousness

[Neo-Scholastic]

What can be inferred is that an external object exists which makes an impression on your mind, which to your sensations appear be the constituents that you have conceptualized as a "desk." The nature of that object as it really exists, however, apart from its relation to your human experience of it, remains unknowable.

At this point I ask myself, about what kind of knowledge are we talking. What part of the object remains unknowable that could not conceivably be known? Sure no one can know a body (physical object) in all its fullness at one time. People are not omniscient, but people can learn. This type of knowledge, about the nature of bodies that are subject to change, is always tentative and uncertain.

However, anyone can learn by experience that similarities between some bodies comes from their shared participation with non-physical attributes, like 'unity' and 'extension'. This type of knowledge, because it is based on things that do not change, forms and/or categories, is both definitive and certain.