Full Idea
If someone sees a resemblance, but feels that it falls far short of the original, they must therefore have a recollection of the original.
Gist of Idea
If we feel the inadequacy of a resemblance, we must recollect the original
Source
Plato (Phaedo [c.374 BCE], 074e)
Book Reference
Plato: 'The Last Days of Socrates', ed/tr. Tredennick,Hugh [Penguin 1969], p.124