Knowledge can hit one on the head (usually the brain) in the guise of a conscious intuition; does it originate inside or outside the brain? Knowledge can be imposed upon one through a dream; who has not experienced that when seeking to solve a significant problem? Confusingly, knowledge can be imparted through a psychic phenomenon, such as a dialogue with the spirit of a dead person (through a clairvoyant) or through a near-death experience (n.d.e.) or through a spiritual experience. The usual path to knowledge is, however, through study and observation (including measurement).
Anyone who has had first-hand exposure to these paths will be the first to admit that psychic and spiritual (including n.d.e.) experiences are personal, non-repeatable, thereby non-verifiable, and possibly unreliable. But then, how reliable is the human brain? As the evidence from neuroscience is not encouraging, what reliability can one place on intuition and dreams?