This document discusses how the mind can influence the body's experience of pain through belief and balancing the autonomic nervous system. It explains that belief can activate the placebo effect, which is effective 30% of the time. Additionally, balancing the sympathetic "fight or flight" system with the parasympathetic "rest and digest" system can help reduce pain. Specific techniques like yoga, meditation, and relaxation exercises can help balance the autonomic system and train the mind to influence the body.