As believers, we can choose to walk in the gift of Grace that God has given us or we can choose to be overly concerned with what is right and fair, the law. Satan traffics in law. God traffics in grace.
If we choose to walk in law we will receive law and judgement in our life. If we choose to walk in grace we will receive the benefits of grace.
This chart helps us to see the difference and which place we are operating in.