Reproving the world of sin
by the words of God is not the same as trying to put one "under the law", or being justified by the works of the law.
God's Word is Light, and exposes the darkness of sin.
John 15:22 "If I had not come and spoken unto them, they had not had
sin: but now they have
no cloak for their
sin."
By Gods law and Word comes
the knowledge of sin.