Full Idea
None of the things predicated in common picks out a this-thing-here, but rather such-and-such a kind.
Gist of Idea
Predications only pick out kinds of things, not things in themselves
Source
Aristotle (Metaphysics [c.324 BCE], 1039a01)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.217
A Reaction
He is in the process of denying that predicates pick out real substances [real being, 'ousia'], but this is clearly aimed at Plato.