Strictly speaking if I say, ‘I’ thought of the Queen and I saluted,’ there is a kind of ambiguity: the ‘I’ that is the subject of the thought is not the ‘I’, the body, that salutes. Thoughts and experiences are modifications in one kind of stuff; movement and position belongs to the other. This part of Descartes’s doctrine marks him as a ‘substance dualist’. It is not just that there are two kinds of properties (mental properties and physical properties) and that persons can have both. It is that there are two kinds of bearers of properties as well. Of course this is theologically convenient:
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