When the Sabbath begins, we should place a guard upon ourselves, upon our acts and our words, lest we rob God by appropriating to our own use that time which is strictly the Lord’s. We should not do ourselves, nor suffer our children to do any manner of our own work for a livelihood, or anything which could have been done on the six working days. Friday is the day of preparation. Time can then be devoted to making the necessary preparation for the Sabbath, and to thinking and conversing about it. Nothing which will in the sight of Heaven be regarded as a violation of the holy Sabbath should be left unsaid or undone, to be said or done upon the Sabbath. God requires not only that we refrain from physical labor upon the Sabbath, but that the mind be disciplined to dwell upon sacred themes. By conversing upon worldly things, or by engaging in light and trifling conversation, we virtually transgress the fourth commandment. Talking upon anything or everything which may come into the mind, is speaking our own words. Every deviation from right brings us into bondage and condemnation. . . .
Those who are not fully converted to the truth, frequently let their minds run freely upon worldly business, and although they may rest from physical toil upon the Sabbath, their tongues speak out what is in their minds; hence these words concerning cattle, crops, losses, and gains. All this is Sabbath-breaking. If the mind is running upon worldly matters, the tongue will reveal it; for out of the abundance of the heart the mouth speaketh…
All heaven was represented to me as beholding and watching upon the Sabbath those who acknowledge the claims of the fourth commandment and are observing the Sabbath. Angels were marking their interest in, and high regard for, this divine institution. Those who sanctified the Lord God in their hearts by a strictly devotional frame of mind, and who sought to improve the sacred hours in keeping the Sabbath to the best of their ability, and to honor God by calling the Sabbath a delight,—these the angels were specially blessing with light and health, and special strength was given them. But, on the other hand, the angels were turning from those who failed to appreciate the sacredness of God’s sanctified day, and were removing from them their light and their strength. I saw them overshadowed with a cloud, desponding, and frequently sad. They felt a lack of the Spirit of God.
– Gospel Workers (1892), pg. 207 – 209