On a different matter but one within the ambit of the current conversation here is a quote from saint Justin the martyr written around 155 AD:
CHAPTER XVIII -- CHRISTIANS WOULD OBSERVE THE LAW, IF THEY DID NOT KNOW WHY IT WAS INSTITUTED.
"For since you have read, O Trypho, as you yourself admitted, the doctrines taught by our Saviour, I do not think that I have done foolishly in adding some short utterances of His to the prophetic statements. Wash therefore, and be now clean, and put away iniquity from your souls, as God bids you be washed in this layer, and be circumcised with the true circumcision. For we too would observe the fleshly circumcision, and the Sabbaths, and in short all the feasts, if we did not know for what reason they were enjoined you,--namely, on account of your transgressions and the hardness of your hearts. For if we patiently endure all things contrived against us by wicked men and demons, so that even amid cruelties unutterable, death and torments, we pray for mercy to those who inflict such things upon us, and do not wish to give the least retort to any one, even as the new Lawgiver commanded us: how is it, Trypho, that we would not observe those rites which do not harm us,--I speak of fleshly circumcision, and Sabbaths, and feasts?
CHAPTER XIX -- CIRCUMCISION UNKNOWN BEFORE ABRAHAM. THE LAW WAS GIVEN BY MOSES ON ACCOUNT OF THE HARDNESS OF THEIR HEARTS.
"It is this about which we are at a loss, and with reason, because, while you endure such things, you do not observe all the other customs which we are now discussing."
"This circumcision is not, however, necessary for all men, but for you alone, in order that, as I have already said, you may suffer these things which you now justly suffer. Nor do we receive that useless baptism of cisterns, for it has nothing to do with this baptism of life. Wherefore also God has announced that you have forsaken Him, the living fountain, and digged for your selves broken cisterns which can hold no water. Even you, who are the circumcised according to the flesh, have need of our circumcision; but we, having the latter, do not require the former. For if it were necessary, as you suppose, God would not have made Adam uncircumcised would not have had respect to the gifts of Abel when, being uncircumcised, he offered sacrifice and would not have been pleased with the uncircumcision of Enoch, who was not found, because God had translated him. Lot, being uncircumcised, was saved from Sodom, the angels themselves and the Lord sending him out. Noah was the beginning of our race; yet, uncircumcised, along with his children he went into the ark. Melchizedek, the priest of the Most High, was uncircumcised; to whom also Abraham the first who received circumcision after the flesh, gave tithes, and he blessed him: after whose order God declared, by the mouth of David, that He would establish the everlasting priest. Therefore to you alone this circumcision was necessary, in order that the people may be no people, and the nation no nation; as also Hosea, one of the twelve prophets, declares. Moreover, all those righteous men already mentioned, though they kept no Sabbaths, were pleasing to God; and after them Abraham with all his descendants until Moses, under whom your nation appeared unrighteous and ungrateful to God, making a calf in the wilderness: wherefore God, accommodating Himself to that nation, enjoined them also to offer sacrifices, as if to His name, in order that you might not serve idols. Which precept, however, you have not observed; nay, you sacrificed your children to demons. And you were commanded to keep Sabbaths, that you might retain the memorial of God. For His word makes this announcement, saying, 'That ye may know that I am God who redeemed you.'
CHAPTER XX -- WHY CHOICE OF MEATS WAS PRESCRIBED.
"Moreover, you were commanded to abstain from certain kinds of food, in order that you might keep God before your eyes while you ate and drank, seeing that you were prone and very ready to depart from His knowledge, as Moses also affirms: 'The people ate and drank, and rose up to play.' And again: 'Jacob ate, and was satisfied, and waxed fat; and he who was beloved kicked: he waxed fat, he grew thick, he was enlarged, and he forsook God who had made him.' For it was told you by Moses in the book of Genesis, that God granted to Noah, being a just man, to eat of every animal, but not of flesh with the blood, which is dead." And as he was ready to say, "as the green herbs," I anticipated him: "Why do you not receive this statement, 'as the green herbs,' in the sense in which it was given by God, to wit, that just as God has granted the herbs for sustenance to man, even so has He given the animals for the diet of flesh? But, you say, a distinction was laid down thereafter to Noah, because we do not eat certain herbs. As you interpret it, the thing is incredible. And first I shall not occupy myself with this, though able to say and to hold that every vegetable is food, and fit to be eaten. But although we discriminate between green herbs, not eating all, we refrain from eating some, not because they are common or unclean, but because they are bitter, or deadly, or thorny. But we lay hands on and take of all herbs which are sweet, very nourishing and good, whether they are marine or land plants. Thus also God by the mouth of Moses commanded you to abstain from unclean and improper and violent animals: when, moreover, though you were eating manna in the desert, and were seeing all those wondrous acts wrought for you by God, you made and worshipped the golden calf. Hence he cries continually, and justly, 'They are foolish children, in whom is no faith.'
CHAPTER XXI -- SABBATHS WERE INSTITUTED ON ACCOUNT OF THE PEOPLE'S SINS, AND NOT FOR A WORK OF RIGHTEOUSNESS.
"Moreover, that God enjoined you to keep the Sabbath, and impose on you other precepts for a sign, as I have already said, on account of your unrighteousness, and that of your fathers,--as He declares that for the sake of the nations, lest His name be profaned among them, therefore He permitted some of you to remain alive,--these words of His can prove to you: they are narrated by Ezekiel thus: I am the Lord your God; walk in My statutes, and keep My judgements, and take no part in the customs of Egypt; and hallow My Sabbaths; and they shall be a sign between Me and you, that ye may know that I am the Lord your God. Notwithstanding ye rebelled against Me, and your children walked not in My statutes, neither kept My judgements to do them: which if a man do, he shall live in them. But they polluted My Sabbaths. And I said that I would pour out My fury upon them in the wilderness, to accomplish My anger upon them; yet I did it not; that My name might not be altogether profaned in the sight of the heathen. I led them out before their eyes, and I lifted up Mine hand unto them in the wilderness, that I would scatter them among the heathen, and disperse them through the countries; because they had not executed My judgements, but had despised My statutes, and polluted My Sabbaths, and their eyes were after the devices of their fathers. Wherefore I gave them also statutes which were not good, and judgements whereby they shall not live. And I shall pollute them in their own gifts, that I may destroy all that openeth the womb, when I pass through them.'
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ST. JUSTIN MARTYR
DIALOGUE WITH TRYPHO
[Typho was a Jew with whom saint Justin corresponded.]