I thought of this argument against the existence of a completely immaterial mind, i.e., a mind that contains no material element. It’s based on a passage in Plato’s Republic.

1. The mind can come into conflict with itself (e.g., when making an important decision).
2. What can come into conflict with itself has parts.
3. What has parts is at least partly composed of matter.
4. Therefore, the mind is at least partly composed of matter.

This is actually consistent with Christian theology, since the Christian can say that the mind has a material part right now, the body, but that the soul will eventually separate from the body in the afterlife and be free of internal conflict. It makes sense that the Christian is able to say this, too, since Plato was the ultimate inspiration for the Christian doctrine of the afterlife (or at least part of its inspiration). I’m posting this because it’s a cool line of reasoning that highlights the fact that Christianity’s dualism is limited in some respects.

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