[mistercheph]

As can be detected by the disdain that other commenters have shown towards even the suggestion that someone might read the Principia Mathematica as opposed to a more modern treatment of the same subject, it is a lack of interest more than a lack of capacity that makes it unintelligible for modern readers. It is utterly comprehensible to any reader who has time, paper and pencil, and a copy of Euclid.