Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

Of the two kinds of material healing, one is due to the fact that in man both health and sickness are contagious. The contagion of disease is violent and rapid, while that of health is extremely weak and slow. If two bodies are brought into contact with each other, it is certain that microbic particles will pass from one to the other. In the same way that disease is transferred from one body to another with rapid and strong contagion, it may be that the strong health of a healthy man will alleviate a very slight malady in a sick person. That is to say, the contagion of disease is violent and has a rapid effect, while that of health is very slow and has a small effect, and it is only in very slight diseases that it has even this small effect. The strong power of a healthy body can overcome a slight weakness of a sick body, and health results. This is one kind of healing (254:3)

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