差以毫厘，谬以千里

Explanation: Difference: a difference; the least bit: a small unit of measurement; absurd: the "Miao." Difference between the very small beginning, the result may cause great errors 　　Usage: Complex sentence; as subject, clause; can not have a trace of error for the stressed 　　Source: Han Ban Gu "Han Qian Chuan": "it is" easy ", saying: 'difference to his fear for a thousand miles'." 　　Examples: ~, Made because of bad consequences is born. ★ "Revolution" Thesaurus:  a minimal error or deviation results in wide divergence; a small error can lead to a serious result, Difference of iota A slight error in the beginning results in a big the winged steed, Difference of the mm tail Err The winged steed