 On Shepherd’s theory, the human mind and body are different essences (EASP: 155–6). This is because the mind is the capacity for sensation in general and the body is the continually existing cause of sensations of extension and solidity in the mind. The former is the capacity for sensations of extension and inextension, solidity and lack of resistance to motion, whereas the latter is the exciting cause of just one member of each pair of mutually contrary sensations. So they are different essences. For this reason, it seems possible in the abstract that the mind and the body should exist separately, but Shepherd reports that the fact of the matter has not been settled. In practice, sensation is never known to take place without the essence that causes sensations of extension. Indeed, the living body, particularly the brain, seems to be integral to the cause of sensation in the species man. She urges that this does not preclude the probability of resurrection after death because there may be matter finer than that which composes the present human body which is capable of causing sensations when conjoined with the human mind (EASP: 157–9). 