I've been finding that most of the "rules" in the various religious and spiritual traditions are valid -- they keep the aura clean.
When you are pure: think purely, act purely . . . your aura is clear. When your aura is clear, you think clearly, you are healthy, you grow and unfold into full potential.
It's not about "obeying" the rules; it's that the rules genuinely have a purpose. If you know that certain actions can mess you up, it's a good idea not to do them. The rules help because are so blatant about it