Full Idea
Nothing touched by imperfection can ever be beautiful.
Gist of Idea
Beauty must always be perfect
Source
Plato (Timaeus [c.362 BCE], 30c)
Book Reference
Plato: 'Timaeus and Critias', ed/tr. Waterfield,Robin [OUP 2008], p.19
A Reaction
Beautiful may also be 'noble'. In human experience this seems obviously false, though it may be true in Plato's world of ideals.