What Lewis means by "supernatural"

A redated post.

To call the act of knowing--the act, not of remembering that something was so in the past, but of 'seeing' that it must be so always and in any possible world--to call this act 'supernatural', is some violence to our ordinary linguistic usage. But of course we do not mean by this that it is spooky, or sensational, or even (in any religious sense) 'spiritual'. We mean only that it 'won't fit in'; that such an act, to be what it claims to be--and if it is not, all our thinking is discredited--cannot be merely the exhibition at a particular place and time of that total, and largely mindless, system of events called 'Nature'. It must break sufficiently free from that universal chain in order to be determined by what it knows.

From Miracles, Chapter 3.

Naturalism without materialism

Many people have made the argument that difficulties for materialism need not be difficulties for ontological naturalism. But that leaves an important question: what is a non-materialist naturalism supposed to look like?

I can imagine a form of naturalism in which God, angels, and what we used to call human souls are part of nature. But then we could even imagine the physical in such a way that all these things are physical. When I took a course on physicalism with Hugh Chandler, who eventually became my doctoral dissertation advisor, he suggested that the physical is whatever is quantified over in an ideally completed physics. Since some theories in physics quantify over God, on that view, God would be physical.

Such definitional liberality, however, would make it difficult to define even methodological naturalism, since it would then no longer exclude what most of typically think it is supposed to exclude.