Study on the insights on Paul's understanding on the law was given a significant impact on its understandings. But the lack of consistency in the Letters seems to be a problem on his understanding of the law when evaluated externally. For example, he was optimistic when he stated in Romans 2:13 that those who hear the law who are righteo us in God's sight and the man who does these things will live by them(Romans 10:5). On the other hand, he was pessimistic in his Letters in Romans 3:20 no one will be declared righteo us in his sight by observing the law. He argues that he is a man of zeal, persecuting the church and arighteous person in Philippians 3:20 but he counters it in Romans 8:7 no can perfectly obey the law. As stated in the Letters, the conflicting arguments of Paul gives a chaotic impression on the law: optimistic or pessimistic. This is the reason why one should study carefully on what Paul's idea was regarding the law. Galatians 3:1-25 brings an answer to the previous statement.
Paul argues that obeying the law does not give God's righteousness but it reveals one's sin and more functions are in it. Paul thinks that the law reveals human sins and enslave them which is a negative function but it links every sinner with God to believe salvation and faith on the promises He has made. Thus, the law plays the role as an elementary teacher who guides one to Christ. Law makes people to look at the salvation and understand the event that Christ has rescued the sinners and the law is a guide of the sinners to Christ. Righteousness can only be obtained by faith in Him. Paul's statements "Christ is the way to eternal life" and "Christ is the end of the law" states that He is the owner of the law and He makes it perfect.
Paul's understanding on the law leads humanity to God 's plan and plays a positive role by stating that the righteousness cannot be obtained by obeying the law but emphasizes that Christ is the only way one can experience His great salvation. Thus, humans realize salvation plan by having faith on Jesus Christ.