For the law was given through Moses; grace and truth came through Jesus Christ.
I almost said, "Just read Galatians." Jesus has been found worthy of greater honor than Moses, says the writer to the Hebrews (3:4) so grace is much superior to the law. The law points out where we are going wrong but is unable to save anyone. To rely on the law would be like trusting in a picture of a fire engine while you lock out the fire brigade when your house is on fire. We cannot earn our salvation we have to accept it as a grace gift. And that's the truth.