Full Idea
The Forms would have to function as paradigms not just for other entities, but also for themselves. ..But this produces an absurd fusion of the paradigm and the copy.
Gist of Idea
Forms have to be their own paradigms, which seems to fuse the paradigm and the copy
Source
Aristotle (Metaphysics [c.324 BCE], 1079b28)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.406
A Reaction
A nice succinct statement of the problem of self-predication (which leads to the Third Man regress, if we posit another Form as a paradigm of the Form we are interested in).