Full Idea
If there did not exist that which we call void and space and intangible nature, bodies would not have any place to be in or move through, as they obviously do move.
Gist of Idea
Space must exist, since movement is obvious, and there must be somewhere to move in
Source
Epicurus (Letter to Herodotus [c.293 BCE], 40)
Book Reference
Epicurus: 'The Epicurus Reader', ed/tr. Inwood,B. /Gerson,L. [Hackett 1994], p.6
A Reaction
The observation that 'they obviously do move' must be aimed at followers of Parmenides. The idea of the void seems to contain a Newtonian commitment to absolute space.