“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)