Full Idea
If objects are reducible to atoms, and each thing passes in an atomic time with its own first atom into an atomic point of space, then all moving things are of equal velocity.
Gist of Idea
If all atoms, times and places are the same, everything should move with equal velocity
Source
Sextus Empiricus (Outlines of Pyrrhonism [c.180], III.77)
Book Reference
Sextus Empiricus: 'Outlines of Pyrrhonism', ed/tr. Bury,R.G. [Prometheus 1990], p.215