To enter into covenant with God under the Old Covenant one must be circumcised, which was a removal of the flesh from the most intimate part of the body. Circumcision means a “cutting around”, and was the symbol that Israel was in covenant and intimate relationship with their God. The flesh that was “cut around” was in fact removed from the body. It was not just left in place to become irritated and scarred. And so, like circumcision, when we are born again, the old sin nature is completely removed, cut off, and a new spirit birthed within us. And that new spirit is perfect and has the nature of God Himself. Two other scriptures highlight this truth:
For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh. But he is a Jew who is one inwardly; and circumcision is that which is of the heart, by the Spirit, not by the letter; and his praise is not from men, but from God. Romans 2:28-29
In Him you were also circumcised with a circumcision made without hands, in the removal of the body of the flesh by the circumcision of Christ; having been buried with Him in baptism, in which you were also raised up with Him through faith in the working of God, who raised Him from the dead. When you were dead in your transgressions and the uncircumcision of your flesh, He made you alive together with Him, having forgiven us all our transgressions. Colossians 2:11-13
Something amazing happens to us when we are truly born from above or born-again. God’s seed is birthed within us. In I John 3:9-10 it says, His seed abides in him; and he cannot sin, because he is born of God. By this the children of God and the children of the devil are obvious. With God’s Spirit living within us, we all have the potential to become like Christ or Christ-like in character. In Greek the word for seed is sperma from which our English word “sperm” is derived. God’s seed, His sperm, is His DNA and it becomes the building blocks for the sum total of His nature to dwell in His children!
So, we see in examples given both by the Apostle Paul and the Apostle John, that a dual nature cannot coexist in a born again person. The terminology of circumcision is clear, the old flesh nature is “cut off”, and a new nature from God that is holy, righteous and pure is birthed within us. The very same nature that Jesus has.