"Excessive" was probably a poorly chosen word. I meant that the books I listed are the ones that provide the deepest insight into the theories (out of all the books I have seen) within the constraints specified by iarwain (presuming nothing more than high school mathematics). Some of the books teach some slightly more advanced math along the way, because yeah, it's hard to really comprehend much of GR without at least a basic conception of differential geometry, or understand QM without some idea of linear algebra, but none of the books inundates you with math like The Road to Reality does.