As the use of earth and water cleanses and purifies the body externally, so it has a purifying influence on the internal part of the body. By eating wholesome food and drinking pure water not only does one receive nourishment, but this cleanses and purifies every particle of the body. It is therefore that an adept must avoid eating and drinking anything unwholesome. This does not mean an absolute restriction to certain food and drink, but just that care in eating and drinking is necessary.