let the perfect be the enemy of the good

Verb
(conjugates through let)


 * 1)  To insist on the total realization of a goal and reject any compromise, thereby decreasing the chance of achieving even a part of that goal.
 * 2) * 1960: Macdonald College, The Macdonald Farm Journal, volumes 21–22, page 7 (R. J. Cooke)
 * More data and more analyses will provide better information for the future, but we dare not let “the perfect be the enemy of the good”.