"There are two great systems in the body of man: the tree of life, which is the arterial with its roots in the heart; and, the tree of the knowledge of good and evil, i.e. the nervous system, which has its roots in the brain. These two "trees" are physical manifestations of a complicated network of branching energy currents in the aura or superphysical bodies."
~Manly P Hall; How to Understand Your Bible