“I myself, a professional mathematician, on re-reading my own work find it strains my mental powers to recall to mind from the figures the meanings of the demonstrations, meanings which I myself originally put into the figures and the text from my mind. But when I attempt to remedy the obscurity of the material by putting in extra words, I see myself falling into the opposite fault of becoming chatty in something mathematical.”
![“[Quantity is the fundamental feature of things,] the 'primarium accidens substantiae,' ...prior to the other categories.” quote by Johannes Kepler](https://sms4smile.com/quotes/img-quotes/4a1/johannes-kepler-4278_categories_quantity-is-the-fundamental-feature-of-t_150994.jpg)
