He is the mediator of a better covenant which was established upon better promises. Hebrews 8:6.
They had witnessed the proclamation of the law in awful majesty, and had trembled with terror before the mount; and yet only a few weeks passed before they broke their covenant with God, and bowed down to worship a graven image. They could not hope for the favor of God through a covenant which they had broken; and now, seeing their sinfulness and their need of pardon, they were brought to feel their need of the Saviour revealed in the Abrahamic covenant and shadowed forth in the sacrificial offerings. Now by faith and love they were bound to God as their deliverer from the bondage of sin. Now they were prepared to appreciate the blessings of the new covenant.
The terms of the “old covenant” were, Obey and live: “If a man do, he shall even live in them” (Ezekiel 20:11; Leviticus 18:5); but “cursed be he that confirmeth not all the words of this law to do them” (Deuteronomy 27:26). The “new covenant” was established upon “better promises”—the promise of forgiveness of sins and of the grace of God to renew the heart and bring it into harmony with the principles of God's law.29Patriarchs and Prophets, 372.
The blessings of the new covenant are grounded purely on mercy in forgiving unrighteousness and sins.... All who humble their hearts, confessing their sins, will find mercy and grace and assurance. Has God, in showing mercy to the sinner, ceased to be just? Has He dishonored His holy law, and will He henceforth pass over the violation of it? God is true. He changes not. The conditions of salvation are ever the same. Life, eternal life, is for all who will obey God's law....
Under the new covenant, the conditions by which eternal life may be gained are the same as under the old—perfect obedience.... In the new and better covenant, Christ has fulfilled the law for the transgressors of law, if they receive Him by faith as a personal Saviour.... In the better covenant we are cleansed from sin by the blood of Christ.30SDA Bible Commentary 7:931.
From God's Amazing Grace - Page 136