The old covenant, which was the law mediated through Moses, was written on stone tablets. But the new covenant, which is by the grace of God through Jesus, is written on human hearts. The purpose of the old covenant was never to save, but to prepare a people for the Savior. The new covenant supersedes the old. The problem with the old covenant was not its content, but the character of the people, for they could not keep it in the flesh. The superiority of the new covenant is evident in that it overcomes the flesh by the power of the Spirit that comes to dwell in those who receive Christ as Savior and Lord.
Has the Lord put His Word in your mind and written it upon your heart? Have you received the new covenant in Jesus Christ?