Christ was a Seventh-day Adventist, to all intents and purposes. It was He who called Moses into the mount and gave him instruction for His people.... In awful grandeur Christ made known the law of Jehovah, giving, among other charges, this charge: “Remember the Sabbath day, to keep it holy.” My brother, you have not placed upon the Sabbath the sanctity that is required by God. Irreverence has come in, and an example has been set that the Lord does not approve. He is not honored and glorified. MM 49.4
There will always be duties which have to be performed on the Sabbath for the relief of suffering humanity. This is right, and in accordance with the law of Him who says, “I will have mercy, and not sacrifice.” But there is danger of falling into carelessness on this point, and of doing that which it is not positively essential to do on the Sabbath. MM 50.1
Unnecessary traveling is done on the Sabbath, with many other things which might be left undone. “Take heed,” saith the Lord, “to all thy ways, lest I remove My Holy Spirit because of the lax regard given to My precepts.” “Remember the Sabbath day, to keep it holy.” Bear in mind the charge to remember. Do not carelessly forget, “Six days shalt thou labor, and do all thy work.” In this time all the duties necessary to prepare for the Sabbath are to be done.—Letter 51, 1901. MM 50.2