That another dispensation and a new covenant was to be given
In Jeremiah: “Behold, the days come, says the Lord, and I will complete for the house of Israel, and for the house of Judah, a new testament, not according to the testament which I ordered with their fathers in that day in which I took hold of their hands to bring them out of the land of Egypt, because they remained not in my testament, and I disregarded them, says the Lord: Because this is the testament which will establish with the house of Israel after those days, says the Lord: I will give them my laws, and into their minds I will write them; and I will be to them for a God, and they shall be to me for a people; and they shall not teach every man his brother, saying, Know the Lord: for all shall know me, from the least even to the greatest of them: for I will be merciful to their iniquities, and will no more be mindful of their sins.”
Source: The Treatises of Cyprian (New Advent)