Purity- A set of Rules?

No. Purity is not a set of rules. Although, rules may help you remain pure that is not what purity is. Purity is a state of mind, it's where you set in your mind that you will remain pure and not waver from it. No matter what life throws at you!!! So, rules in the long run will help you maintain purity; but that is not what purity is.