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Phrase(s): The best is the enemy of the good.
Prov. If you are too ambitious and try to make something better than you are capable of, you may ruin it. • Bob: After I revise it a few more times, my novel will be the best ever written. Alan: I don’t think you should revise it any more. Remember, the best is the enemy of the good. • In fund-raising as in other areas, the best is the enemy of the good. If you ask someone for a larger contribution than he can possibly give, he may give you nothing at all.
McGrawhill's American Idioms And Phrasal Verbs