He did not even then trust His precepts to the memory of a people who were prone to forget His requirements, but wrote them upon tables of stone. He would remove from Israel all possibility of mingling heathen traditions with His holy precepts, or of confounding His requirements with human ordinances or customs. But He did not stop with giving them the precepts of the Decalogue. The people had shown themselves so easily led astray that He would leave no door of temptation unguarded. Moses was commanded to write, as God should bid him, judgments and laws giving minute instruction as to what was required. These directions relating to the duty of the people to God, to one another, and to the stranger were only the principles of the Ten Commandments amplified and given in a specific manner, that none need err. They were designed to guard the sacredness of the ten precepts engraved on the tables of stone. (PP 364.1) MC VC

If man had kept the law of God, as given to Adam after his fall, preserved by Noah, and observed by Abraham, there would have been no necessity for the ordinance of circumcision. And if the descendants of Abraham had kept the covenant, of which circumcision was a sign, they would never have been seduced into idolatry, nor would it have been necessary for them to suffer a life of bondage in Egypt; they would have kept God’s law in mind, and there would have been no necessity for it to be proclaimed from Sinai or engraved upon the tables of stone. And had the people practiced the principles of the Ten Commandments, there would have been no need of the additional directions given to Moses. (PP 364.2) MC VC

The sacrificial system, committed to Adam, was also perverted by his descendants. Superstition, idolatry, cruelty, and licentiousness corrupted the simple and significant service that God had appointed. Through long intercourse with idolaters the people of Israel had mingled many heathen customs with their worship; therefore the Lord gave them at Sinai definite instruction concerning the sacrificial service. After the completion of the tabernacle He communicated with Moses from the cloud of glory above the mercy seat, and gave him full directions concerning the system of offerings and the forms of worship to be maintained in the sanctuary. The ceremonial law was thus given to Moses, and by him written in a book. But the law of Ten Commandments spoken from Sinai had been written by God Himself on the tables of stone, and was sacredly preserved in the ark. (PP 364.3) MC VC