4 ideas
18201 | General principles can be obvious in mathematics, but bold speculations in empirical science [Parsons,C] |
13197 | The notion of substance is one of the keys to true philosophy [Leibniz] |
13198 | Gravity is within matter because of its structure, and it can be explained. [Leibniz] |
16745 | No one even knows the nature and properties of a fly - why it has that colour, or so many feet [Bacon,R] |