How do I know what desires fall into the various categories of natural and necessary desires, and are there hard and fast rules about how to apply the resulting categorization of a particular desire I am considering?"
Cassius Perhaps reformulating the question for clarity?
How do I know what desires are 1) natural and necessary; 2) natural but unnecessary; 3) unnatural and unnecessary ? And are there any rules on how to apply the categorization onto each particular desire I am having? Are there any additional methods or tools for making good choices and avoidances?
Then, can also include aphorisms such as: VS71. Every desire must be confronted by this question: What will happen to me if the object of my desire is accomplished, and what if it is not?