How could science, which validly explores the physical universe and only the physical universe, possibly prove either that there is or that there is not something else real besides the physical universe? It has no data beyond scientific data. It can’t, by its very nature. Saying there are no souls “science sees no souls” is like saying there can be no souls because souls do not leave fossils or emit radiation. It’s a really simple point: How could a fish whose experience is confined to its fishbowl know whether there’s world outside the fishbowl?
--Peter Kreeft, Letters to an Atheist, 2014