Full Idea
With contradiction there can be no intermediate state, whereas with contrariety there can be.
Gist of Idea
There is no middle ground in contradiction, but there is in contrariety
Source
Aristotle (Metaphysics [c.324 BCE], 1055b02)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.298