Full Idea
For Aristotle, having an essence is the criterion of being a substance.
Gist of Idea
Having an essence is the criterion of being a substance
Source
report of Aristotle (Metaphysics [c.324 BCE], 1030a) by Hugh Lawson-Tancred - Introductions to 'Metaphysics' p.178
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.178