According to Catholics, what is the law placed within the Israelite in the New Covenant?

In Jer. 31:31-34 , it is written, >31 “Behold, the days are coming,” said Yahveh, “that I shall cut a new covenant with the house of Israel and the house of Judah, 32 not like the covenant that I cut with their fathers in the day that I took their hand to bring them out of the land of Egypt, which covenant they broke, although I was a husband to them,” said Yahveh. 33 “But this shall be the covenant that I shall cut with the house of Israel. After those days,” said Yahveh, “**I shall put My Law within them, and I shall write it upon their hearts**, and I shall be their god, and they shall be My people. 34 And a man shall no longer teach his neighbor, and a man his brother, saying, “Know Yahveh!” for they all shall know Me, from the least of them even unto the greatest of them, for I shall forgive their iniquity, and I will no longer remember their sin.” In the New Covenant, the prophet Jeremiah states that Yahveh shall put His Law within the Israelites and write it upon their hearts. **According to Catholics, what is this Law that Yahveh puts within the Israelites?**