Simplify the following text for a Grade 8 native English-speaking person.
Original: The colloquial phrase `` to teach someone a lesson '' , means to punish or scold a person for a mistake they have made in order to ensure that they do not make the same mistake again .
Simplified: The slang phrase `` to teach someone a lesson '' , means to punish or scold a person for a mistake they have made making sure that he does not make the same mistake again .