When God intervenes in our lives to impose himself upon us, we are indeed changed. Circumcision of heart is no exception. Our whole personality is transformed and we enter an entirely new spiritual dimension. What was formerly out of reach in regard to serving God now becomes ours. We are truly new creatures!
We are free to love God and live.
Love transforms obedience from drudgery to delight.
And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live (Deuteronomy 30:6).
We can worship in Spirit and truth. We can become the kind of worshippers the Father is seeking.
For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh (Philippians 3:3).
Our inner rebellion, stubbornness, and enmity (or hostility) is destroyed.
It is possible to have that inner war stop; we don’t have to go on fighting God.
Circumcise therefore the foreskin of your heart, and be no more stiffnecked (Deuteronomy 10:16).
We begin to hear God and to respond with cooperation.
A circumcised ear is not possible without a circumcised heart. As long as we are resisting the Holy Spirit, we will fight the things we need the most in God.
Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye (Acts 7:51).
God can write in the fleshly tables of our hearts.
It is no longer necessary for God to thunder His commandments from outside. He does not need to chisel them into stone. He can so plant them in our hearts that they become our “second nature.”
For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people (Hebrews 8:10).
Forasmuch as ye are manifestly declared to be the epistle of Christ ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in the fleshy tables of the heart (2 Corinthians 3:3).
We become receptive to the Holy Spirit.
It is much easier to receive the gift of the Holy Spirit when we are no longer fighting God inside. We can be comfortable to have Him move in to stay.
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them …. and ye shall be my people, and I will be your God (Ezekiel 36:26-28).
(Note: other results could be added to this list by studying a concordance and tracing all the related passages. We can see by these already listed that circumcision of heart is an absolute necessity if we are to walk perfectly before God (Genesis 17:1, 2)