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If you can't do the little things right, you will never do the big things right.

"Adm. McRaven Urges Graduates to Find Courage to Change the World". Remarks by Naval Adm. William H. McRaven, ninth commander of U.S. Special Operations Command, at the University-wide Commencement at The University of Texas at Austin, news.utexas.edu. May 16, 2014.
If you can't do the little things right, you will never do the big things right.