The degree and direction of every motion is, by the laws of nature, prescribed with such exactness that a living creature may as soon arise from the shock of two bodies as motion in any other degree or direction than what is actually produced by it.
Mugimen ororen gradua eta norabidea natur legeek hain zehazki finkaturik dituzte, ezen era berean erraza baita bai izaki biziduna sortzea bi gorputzen elkarjotzetik, bai beste gradu edo norabide bateko mugimena gertatzea.