circumcision (spiritual)- from the Greek word peritome and peritemno; peri meaning -around; temno meaning-to cut. The removal of our ego (self, "I") from our consciousness, soul and spirit, so that we can be aware of our union to the SOURCE of ALL things. All of the references to circumcision refer to the ego being removed from our consciousness.
There are 29 New Testament references in the NASB Bible version.
Colossians 2:10 Paul says, "and in Him you have been made complete and He is the head over all rule and authority; and 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;"
Philippians 3:2-3 Paul says, "Beware of the dogs, beware of the evil workers, beware of the false circumcision; for we are the true circumcision, who worship in the Spirit of God and glory in Christ Jesus and put no confidence in the flesh,"

The three truths of understanding in order to be established in grace and experience the power of the New Covenant:
1) Sin has been taken away by Jesus and not just covered.
Hebrews 10:1 "For the Law, since it has only a shadow of the good things to come and not the very form of things, can never, by the same sacrifices which they offer continually year by year, make perfect those who draw near.
Hebrews 10:9-18 "then He said, 'Behold, I have come to do your will.' He takes away the first in order to establish a second. By this will we have been sanctified through the offering of the body of Jesus Christ once for all. Every priest stands daily ministering and offering time after time the same sacrifices, which can never take away sins; but He, having offered one sacrifice for sins for all time, sat down at the right hand of God, waiting from that time onward until His enemies be made a footstool for His feet. For by one offering He has perfected for all time those who are sanctified. And the Holy Spirit also testifies to us; for after saying, 'This is the covenant that I will make with them after those days, says the Lord; I will put My laws upon their heart, and on their mind I will write them,' He then says, 'And their sins and their lawless deeds I will remember no more.' Now where there is forgiveness of these things, there is no longer any offering for sin."
2) We do not have sin in our heart. We have a pure heart as a new creation in the New Covenant.
3) There is no focus on sin in the flesh in order to be changed. We focus on the consciousness of ONEness to SEE our true identity.
2 Corinthians 3:18, Paul says, "But we all, with unveiled face, beholding as in a mirror the glory of the Lord, are being transformed into the same image from glory to glory, just as from the Lord, the Spirit."
We bear eternal fruit by focusing on ONE. Separation is an illusion.
We have only one nature.
Romans 8:9-10 Paul says, "However, you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him. If Christ is in you, though the body is dead because of sin, yet the spirit is alive because of righteousness."
The New Creation can only be understood or experienced in its fullness with a revelation of spiritual circumcision.
Romans 4:9-17 Paul states, "Is this blessing then on the circumcised, or the uncircumcised also? For we say, 'Faith was credited to Abraham as righteousness.' (this is referring to physical circumcision under the Old Covenant Law) How then was it credited? While he was circumcised or uncircumcised? Not while circumcised, but while uncircumcised; and he received the sign of circumcision, a seal of the righteousness of the faith which he had while uncircumcised, so that he might be the father of all who believe without being circumcised, that righteousness might be credited to them, and the father of circumcision to those who not only are of the circumcision, but who also follow in the steps of the faith of our father Abraham which he had while uncircumcised. For the promise to Abraham or to his descendants that he would be heir of the world was not through the Law, but through the righteousness of faith. For if those who are of the Law are heirs, faith is made void and the promise is nullified; for the Law brings about wrath, but where there is no law, there also is no violation. For this reason it is by faith, in order that it may be in accordance with grace, so that the promise will be guaranteed to all the descendants, not only to those who are of the Law, but also to those who are of the faith of Abraham, who is the father of us all."