Abstract

The Stoics claim that only a body can be a substance (οὐσία). They also claim that the cosmos taken as a whole is one continuous body, finite in extent, comprising within itself all the bodies that there are. Given these claims, one might expect that when confronted with the question of what lies outside the cosmos, the Stoics would take the Aristotelian line: namely, that there is nothing whatsoever outside the cosmos. But this is not what the Stoics say. They say, rather, that outside the cosmos lies an infinite expanse of void, conceived of as a three-dimensional extension empty of body.1Of course, the Stoics do not consider this void outside the cosmos to be a substance, since it is not a body. They class it ..