Do not berate or label your child negatively. Instead, make statements that communicate a belief in your child's overall goodness, but label the behavior. Align yourself with your child, and against the detrimental behavior. Create a safe family environment . This will allow for expression of a full range of feelings, however unpopular they may be.
Children can then separate feelings from actions that are damaging.
Let your child know that we are all tempted to take short cuts at times. Then point out the damaging effects that lying can have on relationships and self-esteem. You end up feeling badly about yourself, too. The suggestions above are usually all that is required to help your child correct their course and restore honesty and healthy self-respect in the process. However, other motivations, when present, may complicate the picture and are worth noting.