Can you imagine going on a diet and still eating whatever you want whenever you want? Yeah, you probably can, but it doesn't work very well does it?! If we want to see a change in our lives we can't keep living the same way. The new way has to take over and the old way has to stop. It's the same with our faith.
Colossians 3:1-17
To have new life means the old life has to die.