20The Law came in so that the offense would increase; but where sin increased, grace abounded all the more, 21so that, as sin reigned in death, so also grace would reign through righteousness to eternal life through Jesus Christ our Lord.
20Moreover the law entered, that the offence might abound. But where sin abounded, grace did much more abound: 21That as sin hath reigned unto death, even so might grace reign through righteousness unto eternal life by Jesus Christ our Lord.
What is the purpose of the law and why did God give it to Moses? Listen to this sermon on Romans 5:20–21 titled “The Law Came In” as Dr. Martyn Lloyd-Jones uses Scripture to explain the main function of the law. He begins by explaining that the law was not made to justify or condemn, as some might believe. Before moving to the real purpose of the law, Dr. Lloyd-Jones points out three ways that the law impacts. First, it increases knowledge of sin by defining it. Second, it increases conviction of sin by opening eyes to it. And lastly, the law actually increases sin. The law shed light on sin and made it evident in the lives of people. Based on these three truths, Dr. Lloyd-Jones then reveals the purpose of the law: to bring people to Christ and help them see their utter need of Him and His salvation. The law is what opens eyes to who they are as sinners and shows the inability to save themselves from it. This is where one experiences the fullness of the grace Christ has to offer. Christians can find hope in knowing that where sin abounds, His grace abounds more.
The Book of Romans
Dr. Martyn Lloyd-Jones
Dr. Martyn Lloyd-Jones (1899-1981) was a Welsh evangelical minister who preached and taught in the Reformed tradition. His principal ministry was at Westminster Chapel, in central London, from 1939-1968, where he delivered multi-year expositions on books of the bible such as Romans, Ephesians and the Gospel of John. In addition to the MLJ Trust’s collection of 1,600 of these sermons in audio format, most of these great sermon series are available in book form (including a 14 volume collection of the Romans sermons), as are other series such as "Spiritual Depression", "Studies in the Sermon on the Mount" and "Great Biblical Doctrines". He is considered by many evangelical leaders today to be an authority on biblical truth and the sufficiency of Scripture.