" When you come to Christ, you were circumcised but not a physical procedure. It was a spiritual procedure the cutting away of your sinful nature."
In the true process of regeneration,there is one important thing that must happen to a believer. This is the spiritual circumcision which refers to the cutting away of the sinful nature. If this one important thing is missing, then there is no genuine born-again experience. Everything will just be merely "head knowledge" or just merely a religious experience. No true transformation will happen but merely reformation.
This process involves complete realization of your utter depravity and sinfulness. Upon this realization the person will be broken in spirit, his heart will break upon realizing how much he/she astrayed from God. This will make the person grieve and mourn for his sins. Without brokenness, there will be no genuine repentance and there will be no genuine conversion.
The circumcision of the Jews during the Old Testament period is a symbol of circumcision that must take place in the heart of anyone who will inherit the Kingdom of God.
This process also involves crushing of the SELF and PRIDE. The sinner will be humbled and stripped of his selfish and wordly desires after such an experience. He/she will see that all the things he formerly hold dearly such as his selfish ambitions and reputations are all futilities. He will realize that it is only by God's grace and mercy he will be able to escape eternal doom. Then he/she will embrace the cross of JesusChrist.