Science has always admitted, and values every day more highly, the importance of cleanliness around the patient and on the part of the physician; and things of different kinds have been used as disinfectants in many cases of disease. The healer, who has to do more with the mind, must, therefore, realize how very important it is to consider purity of mind as well as of body for the purpose. No doubt it is difficult after learning the nature of things to say which is pure and which is impure.

One way of understanding it is that everything in itself is pure, and when another element is mixed with it, then its purity is polluted. Deep thought in this direction would open a vast field to a thinker.
Another way of understanding the pure and impure is that there is one thing alone that keeps things pure, and that is life, and when the life is gone out of them they are impure.
There is a third way of looking at it: that death is impurity of things, but destruction is their purity. This also opens a vast scope of understanding to an observant student of life.

In short, it is necessary for a healer to observe the laws of hygienic life and to keep himself from taking the germs of disease from the patients he heals. Besides, he should avoid all thoughts of bitterness, ill-will, wrath, anger, jealousy, purify his mind from all spite or malice, and bathe so to speak in devotion to God, so that his heart may become saturated with mercy and compassion. It is not only the power of mind that heals, but the purity of mind. The mind free from all crookedness, deceit, treachery, is alone capable of emitting power, strong and pure in its nature, which can give to a patient a new life and relieve him from all pain.