Full Idea
Are there abstract ideas for such things as hair, mud and dirt, which are particularly vile and worthless? That would be quite absurd.
Gist of Idea
It would be absurd to think there were abstract Forms for vile things like hair, mud and dirt
Source
Plato (Parmenides [c.366 BCE], 130d)
Book Reference
Plato: 'Plato IV (Cratylus,Parmenides,Hippias Maj, Min)', ed/tr. Fowler,H.N. [Harvard Loeb 1926], p.211