There are two basic approaches that are possible to take when you see someone doing something wrong.  One is to speak harshly to the person and tell him that what he is doing is wrong.  But this approach does not tell people how they should behave and how they can correct what they did wrong.  This is like stabbing someone with a sword; it is not a healing approach.

The approach of the wise is to show people how they can correct what they did wrong.  This is a healing approach and the only words that are said are those conducive to healing. ~ The Vilna Gaon