Their lack of belief is very real and manifests as a negative force field about them. Those persons who have the belief and the faith in the power of the healing force from God have a different energy field. Their energy field is full of light and is receptive to the light manifesting in the healing efforts. They become their own worst enemy. What we think, thoughts, are very real.
Some thoughts are weak.
Some are strong. And the reply may be yes or no. But we may ask. The customers of a private water company brought a lawsuit because the water taps were producing muddy water constantly. The water table was gradually going down, down, down to the point that there was no more clear clean water in the system to supply the customers.