Genesis 17:14

14.And the uncircumcised man-child In order that circumcision might be the more attended to, God denounces a severe punishment on any one who should neglect it. And as this shows God’s great care for the salvation of men; so, on the other hand, it rebukes their negligence. For since God thus benignantly offers a pledge of his love, and of eternal life, for what purpose does he add threatening but to rouse the sluggishness of those whose duty it is to run with diligence? Therefore, this denunciation of punishment virtually charges men with foul ingratitude, because they either reject or despise the grace of God. The passage however teaches, that such contempt shall not pass unpunished. And since God threatens punishment only to despisers, we infer that the uncircumcision of children would do them no harm, if they died before the eighth day. For the bare promise of God was effectual to their salvation. He did not so attest this salvation by external signs, as to restrict his own effectual working to those signs. Moses, indeed, sets aside all controversy on this subject, by adducing as a reason, that they would make void the covenant of God: for we know, that the covenant was not violated, when the power of keeping it was taken away. Let us then consider, that the salvation of the race of Abraham was included in that expression, ‘I will be a God to thy seed.’ And although circumcision was added as a confirmation, it nevertheless did not deprive the word of its force and efficacy. But because it is not in the power of man to sever what God has joined together; no one could despise or neglect the sign, without both rejecting the word itself; and depriving himself of the benefit therein offered. And therefore the Lord punished bare neglect with such severity. But if any infants were deprived by death of the tokens of salvation, he spared them, because they had done nothing derogatory to the covenant of God. The same reasoning is at this day in force respecting baptism. Whoever, having neglected baptism, feigns himself to be contented with the bare promise, tramples, as much as in him lies, upon the blood of Christ, or at least does not suffer it to flow for the washing of his own children. Therefore, just punishment follows the contempt of the sign, in the privation of grace; because, by an impious severance of the sign and the word, or rather by a laceration of them, the covenant of God is violated. To consign to destruction those infants, whom a sudden death has not allowed to be presented for baptism, before any neglect of parents could intervene, is a cruelty originating in superstition. But that the promise belongs to such children, is not in the least doubtful. For what can be more absurd than that the symbol, which is added for the sake of confirming the promise, should really enervate its force? Wherefore, the common opinion, by which baptism is supposed to be necessary to salvation, ought to be so moderated, that it should not bind the grace of Gods or the power of the Spirit, to external symbols, and bring against God a charge of falsehood.

He hath broken my covenant For the covenant of God is ratified, when by faith we embrace what he promises. Should any one object, that infants were guiltless of this fault, because they hitherto were destitute of reason: I answer, we ought not to press this divine declaration too closely, as if God held the infants as chargeable with a fault of their own: but we must observe the antithesis, that as God adopts the infant son in the person of his father, so when the father repudiates such a benefit, the infant is said to cut himself off from the Church. For the meaning of the expression is this, ‘He shall be blotted out from the people whom God had chosen to himself’. The explanation of some, that they who remained in uncircumcision would not be Jews, and would have no place in the census of that people, is too frigid. We must go farther, and say, that God, indeed, will not acknowledge those as among his people, who will not bear the mark and token of adoption.