Full Idea
Anaxagoras assumed that Mind, which is God, is the efficient principle, and the multi-mixture of homoeomeries is the material principle.
Clarification
The parts of a homoeomery consist of the same stuff as the whole
Gist of Idea
Mind creates the world from a mixture of pure substances
Source
report of Anaxagoras (fragments/reports [c.460 BCE]) by - I.6
Book Reference
Sextus Empiricus: 'Against the Physicists/Against the Ethicists', ed/tr. Bury,R.G. [Harvard Loeb 1997], p.5
A Reaction
The choice of homoeomeries as basic is a good one. They are much better candidates than materials which are made of parts of a quite different kind, where the parts are a better candidate than the whole.