Butevidentlythereisafirstprinciple，andthecausesofthings
areneitheraninfiniteseriesnorinfinitelyvariousinkind。For
neithercanonethingproceedfromanother，asfrommatter，ad
infinitume。g。fleshfromearth，earthfromair，airfromfire，and
soonwithoutstopping，norcanthesourcesofmovementforman