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Phrase(s): Diligence is the mother of good luck.
Prov. If you work carefully and constantly, you will be far more likely to be successful, as if luck had come your way. • Mimi: I’ll never get work as an actress; I always have such bad luck at auditions. Jane: Keep working at it. Diligence is the mother of good luck.
McGrawhill's American Idioms And Phrasal Verbs