What is the difference between the sympathetic and parasympathetic nervous systems?
The sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. The parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.
“The Parasympathetic Nervous System is the gross expression of the central subtle channel (Sushumna Nadi), and cannot be activated by the seeker’s own efforts. Whenever he puts in any effort, his attention moves immediately to the Sympathetic Nervous System, never to the parasympathetic.” -Shri Mataji’s First Book