How do the rules and rituals in the Old Testament show us we can't earn God's forgiveness? In fact, the point of God's Law is to show us how far we are from God and how we can not earn His forgiveness. He set His son on the cross in order to bridge that gap and open the possibility of a relationship with Him. But we are still in danger of taking up a religious mentality even if we have God's forgiveness. Maybe we're still thinking that we can be justified to God through our works.