Discipline is often taken to mean mean punishment. Too much punishment, especially too much sadistic punishment can be seriously harmful.
People often confuse ‘discipline’ with ‘physical punishment’ but they are quite different. Discipline is about guiding children and helping them learn what is expected. They gradually learn how to control their own behaviour. You don’t need to physically punish children to teach them. They learn best when ‘good’ behaviour is encouraged and they feel safe and secure. The key is having a close relationship with your child as well as clear rules and realistic expectations.