Jedi mastery of the 6th sense makes these enlightened beings true woo masters! By developing their senses to a high degree of sensitivity they enable themselves to tune in to the force, the subtle energy which all things emanate. From this sensitivity all their power flows.
"The force" equates to chi in Chinese thought and prana in Hindu thought. These are forms of energy too subtle for science to currently measure but able to be felt by those who sensitize themselves to them.