There was, however, a weakness, or fault, in the original covenant. That fault was with the people, not with the law. "Because finding fault with them, He says: 'Behold, the days are coming, says the LORD, when I will make a new covenant with the house of Israel and with the house of Judah'" (verse 8).
It was because the people "did not continue in My covenant, and I disregarded them, says the LORD" (verse 9).
In the Old Covenant, God wrote the law on tablets of stone. It was external, not part of the thinking and motives of the people. It was in their literature but not in their hearts. In the New Covenant, God writes the law in the minds and hearts of His people (Hebrews:8:10; Jeremiah:31:33-34