(16) Circumcise . . . your heart.--"For circumcision is that of the heart, in the spirit, and not in the letter" (Romans 2:29). The verse literally runs thus: Circumcise the foreskin of your heart, and ye will harden your neck no more. It is the same line of thought as St. Paul's (Galatians 5:16) "Walk in the Spirit, and (then) ye will not fulfil the lust of the flesh."

(17,18) A great God, a mighty, and a terrible . . . he doth execute the judgment of the fatherless and widow.--"Behold (says Rashi) His might! And close beside His might thou mayest find His humility." It is not otherwise in later passages of Scripture: "He healeth the broken in heart, and bindeth up their wounds. He telleth the number of the stars, and calleth them all by their names."

Verse 16. - They were, therefore, to lay aside all insensibility of heart and all obduracy, to acknowledge God's supremacy, to imitate his beneficence, and to fear and worship him. Circumcise therefore the foreskin of your heart. As circumcision was the symbol of purification and sign of consecration to God, so the Israelites are enjoined to realize in fact what that rite symbolized, viz. purity of heart and receptivity for the things of God. This is enforced by the consideration that Jehovah the alone God, the Almighty, is mighty and terrible without respect to persons, and at the same time is a righteous Judge, and the Protector of the helpless and destitute.

10:12-22 We are here taught our duty to God in our principles and our practices. We must fear the Lord our God. We must love him, and delight in communion with him. We must walk in the ways in which he has appointed us to walk. We must serve him with all our heart and soul. What we do in his service we must do cheerfully, and with good will. We must keep his commandments. There is true honour and pleasure in obedience. We must give honour to God; and to him we must cleave, as one we love and delight in, trust in, and from whom we have great expectations. We are here taught our duty to our neighbour. God's common gifts to mankind oblige us to honour all men. And those who have themselves been in distress, and have found mercy with God, should be ready to show kindness to those who are in the like distress. We are here taught our duty to ourselves. Circumcise your hearts. Cast away all corrupt affections and inclinations, which hinder you from fearing and loving God. By nature we do not love God. This is original sin, the source whence our wickedness proceeds; and the carnal mind is enmity against God, for it is not subject to the law of God, neither indeed can be; so then they that are in the flesh cannot please God, Ro 8:5-9. Let us, without delay or reserve, come and cleave to our reconciled God in Jesus Christ, that we may love, serve, and obey him acceptably, and be daily changed into his image, from glory to glory, by the Spirit of the Lord. Consider the greatness and glory of God; and his goodness and grace; these persuade us to our duty. Blessed Spirit! Oh for thy purifying, persevering, and renewing influences, that being called out of the state of strangers, such as our fathers were, we may be found among the number of the children of God, and that our lot may be among the saints.Circumcise therefore the foreskin of your heart,.... Content not yourselves with, nor put your confidence in outward circumcision of the flesh, but be concerned for the circumcision of the heart; for removing from that whatever is disagreeable to the Lord, even all carnality, sensuality, hypocrisy, and superfluity of naughtiness, and for having that put there which is well pleasing in his sight; and which though it is the work of God, and he only can do it and has promised it, yet such an exhortation is made to bring men to a sense of their need of it, and of the importance of it, and to show how agreeable it is to the Lord, and so to stir them up to seek unto him for it; see Deuteronomy 30:6.

and be no more stiffnecked; froward, obstinate, and disobedient, as they had been hitherto; Deuteronomy 9:6.