19 Now we know that whatever the law says it speaks to those who are under the law, so that every mouth may be stopped, and the whole world may be held accountable to God. 20 For by works of the law no human being will be justified in his sight, since through the law comes knowledge of sin.
Romans 3:19-20. On this passage, R.C. Sprout writes:
The point he is making is that every human being is under the law of God to some degree, so that every mouth may be silenced and the whole world held accountable to God.
Paul is drawing a courtroom scene, and God is sitting on the bench. The indictment is being read to the defendant—fallen man. Can you imagine being brought into a courtroom, having an indictment read and then having the judge say to you, How do you plead? As you start to give a defence, suddenly the judge cuts you off in mid sentence and says, You may not speak! There is a certain sense in which the judgment scene of the human race will happen like that.
In Psalm 46, the Psalmist says, Be still, and know that I am God. That passage is often cited as if it were an invitation to enter in to a quiet and tranquil mood of peacefulness, in which one can contemplate the wonders and majesty of God. But that’s not the force of this psalm. The Psalmist is using, in Hebrew, very strong language. What he is having God say, literally, is, Shut up! Be quiet! Stop it! and know that I am God.”
R. C. Sproul, The Gospel of God: An Exposition of Romans (Great Britain: Christian Focus Publications, 1994), 70–71.