It is said that people will often rise no higher than what is expected of them. It is the rare person who is self-motivated to go beyond what others expect. This maxim is especially true of young people.
If God were teaching your class today—and He is—what truths would He want your students to leave knowing? What would He expect them to do with what they learn? At some point during the teaching of the lesson—at the end of the lesson is probably best—share with your students the lessons God has shown them through His Word. Then, let them know that God is patient and willing to help them make right decisions based on what they have learned, that His grace will help them up when they miss the mark. Let them know that Jesus wants to come into their lives to help them live lives that please God and meet His great expectations for them.