Constantine, while still a heathen, issued a decree enjoining the general observance of Sunday as a public festival throughout the Roman Empire. After his conversion he remained a stanch advocate of Sunday, and his pagan edict was then enforced by him in the interests of his new faith. But the honor shown this day was not as yet sufficient to prevent Christians from regarding the true Sabbath as the holy of the Lord. Another step must be taken; the false sabbath must be exalted to an equality with the true. A few years after the issue of Constantine’s decree, the Bishop of Rome conferred on the Sunday the title of Lord’s day. Thus the people were gradually led to regard it as possessing a degree of sacredness. Still the original Sabbath was kept. (SR 329.1) MC VC

The archdeceiver had not completed his work. He was resolved to gather the Christian world under his banner, and to exercise his power through his vicegerent, the proud pontiff who claimed to be the representative of Christ. Through half-converted pagans, ambitious prelates, and world-loving churchmen he accomplished his purpose. Vast councils were held, from time to time, in which the dignitaries of the church were convened from all the world. In nearly every council the Sabbath which God had instituted was pressed down a little lower, while the Sunday was correspondingly exalted. Thus the pagan festival came finally to be honored as a divine institution, while the Bible Sabbath was pronounced a relic of Judaism, and its observers were declared to be accursed. (SR 329.2) MC VC