The knowledge of bacteria and the various germs associated with disease has played havoc in the minds of tens of thousands of people, and by the dread aroused in them has in itself rendered them more susceptible of attack. While lower forms of life, such as bacteria, may play a part in or be associated with physical disease, they constitute by no means the whole truth of the problem, as can be demonstrated scientifically or by everyday occurrences. There is a factor which science is unable to explain on physical grounds, and that is why some people become affected by disease while others escape, although both classes may be open to the same possibility of infection. Materialism forgets that there is a factor above the physical plane which in the ordinary course of life protects or renders susceptible any particular individual with regard to disease, of whatever nature it may be.
Fear, by its depressing effect on our mentality, thus causing disharmony in our physical and magnetic bodies, paves the way for invasion, and if bacteria and such physical means were the sure and only cause of disease, then indeed there might be but little encouragement not to be afraid. But when we realise that in the worst epidemics only a proportion of those exposed to infection are attacked and that, as we have already seen, the real cause of disease lies in our own personality and is within our control, then have we reason to go about without dread and fearless, knowing that the remedy lies with ourselves. We can put all fear of physical means alone as a cause of disease out of our minds, knowing that such anxiety merely renders us susceptible, and that if we are endeavouring to bring harmony into our personality we need anticipate illness no more than we dread being struck by lightning or hit by a fragment of a falling meteor."
Dr. Edward Bach in “Heal Thyself”, 1931