But what has been the utility of those schools? What science is there at this day acquired by their readings and disputings? That we have of geometry, which is the mother of all natural science, we are not indebted for it to the schools. Plato, that was the best philosopher of the Greeks, forbad entrance into his school to all that were not already in some measure geometricians. There were many that studied that science to the great advantage of mankind: but there is no mention of their schools; nor was there any sect of geometricians; nor did they then pass under the name of philosophers. The natural philosophy of those schools was rather a dream than science, and set forth in senseless and insignificant language; which cannot be avoided by those that will teach philosophy without having first attained great knowledge in geometry. For Nature worketh by motion; the ways and degrees whereof cannot be known, without the knowledge of the proportions and properties of lines and figures. Their moral philosophy is but a description of their own passions.