“You can only chase a butterfly for so long.”
Source: Prince Across the Water
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Jane Yolen 28
American speculative fiction and children's writer 1939Related quotes
                                        
                                        According to  The Quote Investigator http://quoteinvestigator.com/2014/04/17/butterfly/, "the earliest instance of this saying was crafted by the enigmatic “L” for “The Daily Crescent” newspaper in New Orleans [in June 1848]. ... The linkage to Henry David Thoreau is unsupported." 
Misattributed
                                    
Source: Special Topics in Calamity Physics
                                        
                                        for better or for worse. 
Nobel lecture (2001)