There is one aspect of our own mentality for which it's difficult as yet to foresee what type of explanation would even be relevant. I'm referring, of course, to consciousness. The point is that although I have no reason to believe that my consciousness is implemented by anything other than my brain, I remain convinced that there's something impenetrably mysterious about the relationship between brains and thoughts. And you can understand, therefore, why it's so hard to imagine, let alone tolerate, the idea that the death of the brain necessarily leads to the end of the personal self – and this, of course, is the "trump card" with which religion has consistently played.