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A website for the book by Ian J Thompson:

"Rational Scientific Theories from Theism"


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4.1 Substance

In order to understand the existence of physical and mental things, even of divine things, we need to treat them as actually existing. They cannot be merely concepts, hypotheses, forms, or information. We may describe some of them by mathematics but actual things are not constituted by mathematics. This amounts to taking an Aristotelian view of reality, wherein every real thing is some kind of substance and has powers for change. This can immediately be contrasted with an extreme Platonic view, wherein only ideal forms are real, and things in our world are merely some kind of image or shadow of those ideal forms.

Following Aristotle, we can analyze the nature of individual things. We see how they all have some form and are all composed of some matter (Greek hyle). I am going to say that objects all have some form, and that form is a form of some underlying substance or stuff.4.1By the term ‘form’, I refer not just to the external shape of an object, but to all the internal structure and descriptive details necessary to make a full account of what actually exists at a given moment. Spatial structures are forms, and so also are any other structures needed, whether they are spatial or not.4.2This use of the term ‘form’ refers only to static or categorical properties that can be attributed at any one time. It therefore excludes causal principles since these describe what might happen at later times.4.3The form and substance of each thing can be intellectually distinguished, but they never exist apart in reality. It is never the case that the form of a thing is here and the substance of it is over there.

This is to adopt a realism that takes seriously the need for substance and also for changes and processes involving substantial objects. Each object cannot merely exist self-sufficiently but must be closely linked to others by causes and/or effects. We therefore need a serious account of how causes exist and operate and how the causal powers of objects are related to their substantial nature. Because science is continually discovering new kinds of causes and new ways of causation, the realism here is not a naive realism wherein we take as real just what appears to our senses. There are enormously many things and causes that science postulates that are not apparent to our senses but are inferred from empirical or theoretical considerations.

The present realism, because it stresses the leading role of causes and powers in generating new processes, is going to be called ‘generative realism.’ If we want a slogan, we could say “No process without structure, no structure without substance, no substance without power, no power without process."

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