Here are two textbooks about the general relativity.One was written by Dirac, and the other by Wheeler et al. Although the theme is the same between them, there is the big difference, which is thickness of the books. I think it is correct to assume that this difference is clearly reflecting the difference in the standing point to look at physics. (I mean, simply the difference in their personal characters.....maybe.)
I bought Dirac's book about 10 years ago. This book contains just 100 pages, with large letters and many pages with a lot of white blank. But, still I don't finish reading it. On the other hand, I already read about 50 pages of Wheeler's, which I bought last year. Interestingly, the ratio (R) of the pages I have ever read (P) and the total page (T) is the same for Dirac's and Wheeler's. (Namely, R_dr \simeq R_wh, where R=P/T.) This may explain the conservation of momentum to understand physics???
