let (the) perfect be the enemy of (the) good

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let (the) perfect be the enemy of (the) good

To allow the demand, desire, or insistence for perfection decrease the chances of obtaining a good or favorable result in the end. (Usually used in the negative as an imperative.) I know you want your research paper to be great, but don't let perfect be the enemy of good, or you won't even finish it in time! As a manager, you have to realize both the potential and the limits of your employees, so be sure not to let the perfect be the enemy of the good.
See also: enemy, good, let, of, perfect