Paul keeps encouraging the new converts to go forward and not turn back to the old law and traditions. Since we now live under grace, we are no longer bound by the laws of the Old Testament. Why? Have they been destroyed or nullified by God? No, definitely not. Why, then? Because, as Jesus Himself said:
17 “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.—Matt. 5:17 (NIV)
Since Jesus fulfilled the law, we are no longer bound by that law. We live under the covenant of grace. If we believe keeping one point of the law is necessary for salvation, then we are bound by all the points of the law. If it were possible for man to fulfill every point of the law, then Jesus died a useless death on the cross. Our salvation comes only by “grace through faith” in His finished work at Calvary. Does this mean we just accept Jesus and do nothing? No, there is work for us to do, but the work does not add to our salvation.
For it is by grace you have been saved,through faith—and this is not from yourselves, it is the gift of God— 9 not by works, so that no one can boast. 10 For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.–Eph. 2:8-10 (NIV)
Jesus “paid it all” and we are the beneficiaries of His death.