One would like to know a little more about the nature of the soul and its relationship with the body, but Descartes never proposed a final theory about these issues. From passages such as the ones we have just quoted one might infer that he was an interactionist who thought that there are causal interactions between events in the body and events in the soul, but this is by no means the only interpretation that has been put forward. In the secondary literature, one finds at least the following interpretations.