Romans 3:19-20

Now we know that whatever the Law says, it speaks to those who are under the Law, so that [the murmurs and excuses of] every mouth may be hushed and all the world may be held accountable to God. For no person will be justified (made righteous, acquitted, and judged acceptable) in His sight by observing the works prescribed by the Law. For [the real function of] the Law is to make men recognize and be conscious of sin [not mere perception, but an acquaintance with sin which works toward repentance, faith, and holy character].