“There are hordes of people today who would like us to believe that in their wisest moments they were doing their thinking with the help of some special faculty. Whether one calls it divine illumination or, in the modern fashion, merely intuition, it is a hindrance to real understanding. Nothing is to be gained by yielding to notions that would not stand up under careful scrutiny. That would only be like Icarus’s wax wings, which melted with the altitude. If one wishes to fly other than in dreams, one must master it on metal wings.”