Abstract

O'Keefe's contention that Epicurus devised the atomic swerve to counter a threat to the efficacy of reason posed by the thesis that the future is fixed regardless of what we do, is not supported by the evidence he adduces. Epicurus' own words in On nature XXV, and testimony from Lucretius and Cicero, tell far more strongly in favour of the traditional view, that Epicurus' concerns were causal determinism and its threat to moral responsiblity for our actions and characters.