Full Idea
A unit is a positionless substance, and a point a substance having position.
Gist of Idea
Units are positionless substances, and points are substances with position
Source
Aristotle (Posterior Analytics [c.327 BCE], 87a36)
Book Reference
Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.41