The secondary rules are of three types: rules regarding self; rules regarding society; rules regarding the afterlife. Rules regarding the self are of two categories: those for the body and those for the mind. Those rules to keep a person's body properly nourished so that they can remain healthy are the bodily rules. Such things as regulated drinking, eating, sleeping, exercise, and for sickness, prescriptions for cure, are bodily rules.
If people do not follow these rules, they cannot pass through life smoothly. If they do not follow the mental rules, their power of realization, concentration, imagination, contemplation and judgment will be weak and will not properly function. There will be no advancement in arts and sciences, and moreover one will not be able to take the mind from material thoughts and direct it to thoughts of God. As a result, sinful thoughts and atheistic attitude will dominate the mind; finally a person will become no better than a beast. Therefore these bodily and mental rules are very necessary for success in human life.
- Bhaktivinoda Thakura, Caitanya Siksamrta
