An ounce of prevention is worth a pound of cure

Cultural  

1. A little precaution before a crisis occurs is preferable to a lot of fixing up afterward. (See also A stitch in time saves nine.)

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ounce of prevention is worth a pound of cure, an Idioms  

1. It is easier to forestall a disaster than to deal with it. For example, The new law makes all children under twelve wear bicycle helmets—an ounce of prevention. This ancient proverb is first recorded in Latin in Henry de Bracton's De Legibus (c. 1240) and has been repeated ever since, often in shortened form.

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