Newton's metaphysics: The Cambridge Companion to Newton. Cambridge University Press. 2016. Sid. 333. doi:10.1017/cco9781139058568.010. ”as for instance is plain from this, that they would easily concede extension to be a substance like a body if only it could move and could exercise the actions of a body; and on the other hand, they would by no means concede a body to be a substance if it neither could move nor arouse any sensation or perception in any mind whatever.”
