Well today I had a dental appointment. On the way to said appointment I was hoping that I would find out that I had no cavities this time. This thought led me to think of an analogy in a way. In order for it to work you need to imagine that everytime you go to the dentist no matter how good you have tried to clean your teeth on your own you still have cavities.
So as you are on the way to the appointment you are hoping that the dentist won't find any of the cavities. In the same way we often hope that God will not see the sins that we commit if we do our best to try and clean them up. But in the end the dentist will find the cavities. In that same sense God will find our sin no matter what we do.
Now we come to the Gospel portion. (Just assume that the dentist can fix the cavities) When we find out that we have cavities we depend on the dentist to fix those cavities for us and the we can once again have perfect smiles. This is the same way that we depend on our faith in Jesus to wash away our sins and restore us to perfection in the eyes of our heavenly father. There we go I hope that made sense. As I tend to say at this time I'm a little tired so if it doesn't make sense or something is out of place be sure to offer some insight.