prevent a problem so you don't have to solve it, a stitch in time... Forest fires deserve an ounce of prevention: public education in campfire safety.
AN OUNCE OF PREVENTION IS WORTH A POUND OF CURE
Meaning of AN OUNCE OF PREVENTION IS WORTH A POUND OF CURE in English
English idioms vocab. Словарь английских идиом и выражений. 2012