Romans 3:19-20, 27-28

We know that the law’s commands are for those who have the law. This stops all excuses and brings the whole world under God’s judgment, because no one can be made right with God by following the law. The law only shows us our sin.

So do we have a reason to brag about ourselves? No! And why not? It is the way of faith that stops all bragging, not the way of trying to obey the law. A person is made right with God through faith, not through obeying the law.