 Given that souls are incorporeal adjuncts of the body, it follows that they are not materially destructible, and that the laws of interaction between soul and body are not laws of natural philosophy. Why grass looks green is a feature of the world which God decided upon and upholds. His reasons for this decision, says Boyle, were no doubt weighty, but they are, as to us, arbitrary (see, e.g., BP 2:62, BOA §3.5.1, p 247; 2:105, BOA 3.5.21, p 258; 9:40; 36.46v). Now, if our souls are non-material, that demolishes at least one philosophical barrier to a belief in an after-life such as is promised by Christianity. (For a detailed discussion of Boyle’s views on perception see Anstey 2000.)