There is evidence that healing power can travel between humans, spirits and God. Spirits and human beings are sentient life forms capable of producing energy of one kind or the other. Healing energy or white light can be focused by life forms interconnected through a common mind.
The spiritual circle draws the negative/dark energy out of the patient/believer and then bathes the injured body part or organ with a warm relaxing photonic wave. The pain, the dark energy goes through sensitive human souls into spiritual beings. In a human, this pain is often felt as grief and despair.
There are different ways to obtain a healing. While a miracle can be instantaneous, a healing usually takes some time to complete.