However, given the ancient witness to contemplative knowing and the great abundance of evidence for psi phenomena, many sources of which I cite in subsequent chapters, it is a great mistake to exclude such things from our accounts of human nature.  That is why many, if not most, great thinkers since antiquity have given paranormal events and mystical truth claims a central place in their philosophies.  

It is difficult to estimate how many extraordinary attributes are available to us, given our general ignorance today about the further reaches of human nature.  We do not know how many human potentials are neglected or suppressed in this (and every) culture.  But it would not be difficult, I believe, to enlarge the inventories . . .