Just as in certain circumstances we can become servants of the evil spirits of illness and misfortune, so too we can become the servants of those spiritual beings who promote health and growth, who send down from the spiritual world into our physical world forces that help life to flourish. It is nothing but a materialistic superstition to believe that physical hygiene and external regulations are the sole means of promoting health.
Everything that happens in physical life is directed by the beings and powers of higher worlds who are all the time pouring into the physical world forces which in a certain way work freely, upon human or other beings, either promoting or harming health and growth. Certain specific spiritual powers and beings are responsible for these processes in health and illness.
In the life between death and rebirth man co-operates with these powers; and if we have prepared ourselves in the right way we can experience the bliss of co-operating in the task of sending the forces which promote health and growth, from the higher worlds into this physical world.