1 Paul, a bond-servant of Christ Jesus, called as an apostle, set apart for the gospel of God, 2 which He promised beforehand through His prophets in the holy Scriptures, 3 concerning His Son, who was born of a descendant of David according to the flesh, 4 who was declared the Son of God with power by the resurrection from the dead, according to the spirit of holiness, Jesus Christ our Lord. . .
Here are a few facts about Romans
1. In the ancient biblical times once a slave was free they had the choice to leave from their master or be a "bond-servant". If the slave wished to be a bond servant the master would nail their ear to the door post. This spiritually represents ones ears being OPENED to the WORD of TRUTH by THE DOOR who is Jesus himself (John 10:9)
2. An apostle is one who is "sent out" for a specific purpose or work. Pauls was specifically to preach the gospel to the nations and bring down the dividing line between JEWS and NON-JEWS. The Jewish tradition viewed NON-JEWS as the scum of the earth.
3. Pauls primary purpose of writing this Epistle is that the Believers in Rome, who were mostly British, would know the will of God. The perfect will of God is found in 4 things: 1. Knowing Him 2. Knowing His will 3. Doing His Will 4. Agreeing with His will... His Will (ie his character his nature) are found in HIS LAW. His Law is every word spoken by Him to his servants for their obedience, discipline and restoration.
Romans 2:18 and know His will, and approve the things that are essential, being instructed out of the Law.
If you know his will then YOU are instructed out of the law and you agree with David as he proclaimed "I delight to do Thy will, O God; Thy Law is within my heart" Ps 40:8
Romans 6:12 says "So then, the Law is holy, and the commandment is holy and righteous and good."
Blessings in your Study!!