Fire is a good servant but a bad master

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.
See also: bad, but, fire, good, master