When we continue to overlook their wrongdoings only reinforces sinful habits in us and our children. An example would be punishing the child one day for hitting his sister and then the following week let it go. Another example could be when parents do not agree on the same standards: one parent yells while the other spanks for the same ‘offense’.
God says: “Because sentence against an evil work is not executed speedily, therefore the heart of the sons of men is fully set in them to do evil” (Eccl. 8:11).
To be fair, children should be trained to obey right away, not when they feel like it.
Delayed obedience is disobedience!
When correction is given quickly, they are more likely to “get the picture” that such behavior is not tolerated or profitable to them.