 One direct quotation preserved from Leucippus says that nothing happens in vain (matên) but everything from logos and by necessity (DK 67B2). This has been found puzzling, since the reference to logos might seem to suggest that things are ruled by reason, an idea that Democritus' system excludes. Either Leucippus' system is different in this respect from that of Democritus, or the reference to logos here cannot be to a controlling mind. Barnes takes there to be no grounds for preferring either interpretation (Barnes 1984), but Taylor argues that Leucippus' position is that an account (or logos) can be given of the causes of all occurrences (Taylor 1999, p. 189). There is nothing in other reports to suggest that Leucippus endorsed the idea of a universal intelligence governing events.