19 Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world held accountable to God. 20 Therefore no one will be declared righteous in his sight by observing the law; rather, through the law we become conscious of sin.
Have you ever been around someone that wouldn’t stop talking? You find yourself thinking that you would give almost anything just to get a break from the incessant babble. This isn’t quite the same thing, but this passage says that God’s Word, specifically His law, can stop the mouth. I have actually seen this in practice a few times. God’s Law is able to work in a person’s life to stop them from justifying themselves and helping them to understand where they truly stood before God. His Word is like that in all of our lives. It shines a beacon of light inside to help us see our true self, the way God sees us.