God had said, HE will circumcise our hearts (with the circumcision of Christ).
That thou shalt return and obey the voice of the LORD, and do all his commandments which I command thee this day. If thou shalt hearken (through this Christ) unto the voice of the LORD thy God, to keep his commandments and his statutes which are written in this book of the law, and if thou turn unto the LORD thy God with all thine heart, and with all thy soul. For this commandment which I command (hearkening unto the voice of the LORD; the circumcision made without hands to keep HIS commandments and statutes contained in the Book of the Law; the Word; Christ) thee this day, it is not hidden from thee, neither is it far off. It is not in heaven, that thou shouldest say, Who shall go up for us to heaven, and bring it unto us, that we may hear it, and do it? Neither is it beyond the sea, that thou shouldest say, Who shall go over the sea for us, and bring it unto us, that we may hear it, and do it? But the word (HIS commandments and statutes contained in the Book of the Law; the Word; Christ) is very nigh unto thee, in thy mouth, and in thy heart (the circumcision made without hands), that thou mayest do it. This the FAITH in which we preach. For we are the epistle of Christ , Written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart. And such trust have we through Christ to God-ward: Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God. For Christ (In our hearts, minds, and mouths) is the end of the Law (that which is written with ink and tables of stone) for righteousness unto all that believe.
(Deu 30:8-16; Romans 10:6-8, 4,6; 2Co 3:2-5)
Christ in us the hope of Glory. Not us but Christ. He is the way the truth and the life. Without Him we can do nothing. We are a new creature in Christ Jesus. Old things have passed away; Behold all has become new and is of GOD!