It is surely important, when a child has been dishonest, to get to the facts of what happened and to encourage the child to face up to them. But it is rarely good to probe into the child's motives, and always wrong to push for a confession. After all, it may be nothing more than embarrassment or shame that caused the child to wriggle out of something by means of a half-truth to begin with, and if pressed, he may be so afraid of the consequences that he will tell an outright lie. It is always best to believe in the power of good and to give a child the benefit of doubt.
Forgiveness is necessary dozens of times a day.
No matter how many times a child gets into trouble, never lose faith in him. To label a child as hopeless is to be tempted by despair, and to the extent that despair is a lack of hope, it is also a lack of love. The willingness to be vulnerable is an important part of parenting, too. For my wife and me, few experiences brought us as close to our children as the times we overreacted but then realized it and asked them to forgive us. If nothing else, it reminded us each time that just as we adults depend on the promise of being able to start over every morning, children do too.