Full Idea
Of the small there is no smallest, but always a smaller.
Gist of Idea
Things get smaller without end
Source
Anaxagoras (fragments/reports [c.460 BCE], B03), quoted by Gregory Vlastos - The Physical Theory of Anaxagoras II
Book Reference
Vlastos,Gregory: 'Studies in Greek Phil I: The Presocratics', ed/tr. Graham,D.W [Princeton 1993], p.312
A Reaction
Anaxagoras seems to be speaking of the physical world (and probably writing prior to the emergence of atomism, which could have been a rebellion against he current idea).