He that chastiseth one, amendeth many.

The proverb presents correction as having an effect beyond the person who receives it. Addressing one person’s misconduct may prompt others to change their behavior too.

It can justify taking action in an individual case for the sake of a wider group. The saying emphasizes the hoped-for benefit to others, rather than the experience of the person being corrected.

Use it when arguing that a response to one person’s misconduct may encourage better behavior among others. It is less apt when the correction is private and unlikely to influence anyone else.