Full Idea
Everything that is has one single essence [en esti to einai].
Gist of Idea
Everything that is has one single essence
Source
Aristotle (Topics [c.331 BCE], 141a36)
Book Reference
Aristotle: 'Posterior Analytics and Topica', ed/tr. Tredennick,H/Forster,ES [Harvard 1960], p.575
A Reaction
Does this include vague objects, and abstract 'objects'? Sceptics might ask what grounds this claim. Does Dr Jeckyll have two essences?