Full Idea
Motion is transmitted to innumerable things, and this must spring from some initial principle, which must be the change effected by self-generated motion.
Gist of Idea
Movement is transmitted through everything, and it must have started with self-generated motion
Source
Plato (The Laws [c.349 BCE], 895a)
Book Reference
Plato: 'The Laws', ed/tr. Saunders,Trevor J [Penguin 1970], p.424