Dear Rawn, Thanks for your reply. I've been mulling it over and everything which you wrote makes sense to me. The only thing which I am not entirely clear on is this sentence: >>Consider this: every physical necessity has an underlying mental necessity.<< When I first read it I thought 'oh yeah, that makes sense', but then when I really took the time to consider it, I was not sure I knew exactly what you meant. Firstly, I am assuming that you are using the word 'mental' in a Bardonian way, is that correct? If so, I cannot quite understand what you are saying. Would it be possible to give an example? I could have understood if you had said that every physical necessity has an underlying mental *cause*... Do you mean that there is a mental equivalent for every physical necessity? If that' the case, I tried to think it through using some examples of physical necessities, such as sleep. What would the underlying mental necessity of drinking water be, for example? I'd appreciate any further explanations on this topic that you could give. Thanks, Martin