How does the law serve its purpose according to the Bible?

The law serves as a mirror to reflect humanity's sinful nature and inability to attain righteousness. In Romans 3:19-20, Paul explains that 'whatever the law says, it says to those who are under the law; that every mouth may be stopped, and all the world may become guilty before God.' The purpose of the law is to show us that we cannot justify ourselves; thus, it leads to a profound understanding of our need for a Savior. The law functions as a schoolmaster, guiding us to recognize our need for grace and its fulfillment in Jesus Christ, whose righteousness is credited to those who believe in Him.