Genesis 17:11

11.Ye shall circumcise the flesh of your foreskin Very strange and unaccountable would this command at first sight appear. The subject treated of, is the sacred covenant, in which righteousness, salvation, and happiness are promised; whereby the seed of Abraham is distinguished from other nations, in order that it may be holy and blessed; and who can say that it is reasonable for the sign of so great a mystery to consist in circumcision? (408) But as it was necessary for Abraham to become a fool, in order to prove himself obedient to God; so whosoever is wise, will both soberly and reverently receive what God seems to us foolishly to have commanded. And yet we must inquire, whether any analogy is here apparent between the visible sign, and the thing signified. For the signs which God has appointed to assist our infirmity, should be accommodated to the measure of our capacity, or they would be unprofitable. Moreover, it is probable that the Lord commanded circumcision for two reasons; first, to show that whatever is born of man is polluted; then, that salvation would proceed from the blessed seed of Abraham. In the first place, therefore, whatever men have peculiar to themselves, by generation, God has condemned, in the appointment of circumcision; in order that the corruption of nature being manifest, he might induce them to mortify their flesh. Whence also it follows, that circumcision was a sign of repentance. Yet, at the same time, the blessing which was promised in the seed of Abraham, was thereby marked and attested. If then it seem absurd to any one, that the token of a favor so excellent and so singular, was given in that part of the body, let him become ashamed of own salvation, which flowed from the loins of Abraham; but it has pleased God thus to confound the wisdom of the world, that he may the more completely abase the pride of the flesh. And hence we now learn, in the second place, how the reconciliation between God and men, which was exhibited in Christ, was testified by this sign. For which reason it is styled by Paul a seal of the righteousness of faith. (Romans 4:11.) Let it suffice thus briefly to have touched upon the analogy between the thing signified and the sign.