A strong man cannot help a weaker unless the weaker is willing to be helped, and even then the weak man must become strong of himself; he must, by his own efforts, develop the strength which he admires in another. None but himself can alter his condition.
Correcting a careless mistake only provides a temporary solution; cultivating the habit of careful scrutiny can permanently solve the problem.
When you solve problems at the result level, you only provide temporary solutions. To achieve lasting progress, you must address them at the system level. Fix the input, and the output will self-correct.