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Phrase(s): Fire is a good servant but a bad master.
Prov. You must be careful to use fire wisely and under control so that it will not hurt you. • Don’t play with the candle flames, children. Fire is a good servant but a bad master. • At camp, we learned how to build and extinguish fires safely, since fire is a good servant but a bad master.
McGrawhill's American Idioms And Phrasal Verbs