From the foregoing it is clear that the following rules will be of great service in determining the true nature of motion:
- To distinguish mathematical hypotheses from the natures of things;
- To beware of abstractions;
- To consider motion as something sensible, or at least imaginable; and to be content with relative measures.
If we do so, all the famous theorems of the mechanical philosophy by which the secrets of nature are unlocked, and by which the system of the world is reduced to human calculation, will remain untouched; and the study of motion will be freed from a thousand minutiae, subtleties, and abstract ideas. And let these words suffice about the nature of motion.