Full Idea
Democritus, the founder of atomism, preferred to accept that all things happened by necessity than to tear from the atomic bodies their natural motions.
Gist of Idea
Democritus said everything happens of necessity, by natural motion of atoms
Source
report of Democritus (fragments/reports [c.431 BCE]) by M. Tullius Cicero - On Fate ('De fato') §22
Book Reference
'Hellenistic Philosophy: Intro Readings', ed/tr. Inwood,B. /Gerson,L. [Hackett 1988], p.38
A Reaction
This is in opposition to Epicurus, who said that atoms can have a 'swerve', making free will possible. It is suggested that Epicurus was the first to really grasp the problem of free will. Democritus was just stating the (to him) obvious.