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…. {GW92 207.1}
God has given men six days wherein to labor, and He requires that their own work be done in the six working days. Acts of necessity and mercy are permitted on the Sabbath, the sick and suffering are at all times to be cared for; but unnecessary labor is to be strictly avoided. “Turn away thy foot from the Sabbath, from doing thy pleasure on My holy day; and call the Sabbath a delight, the holy of the Lord, honorable; and … honor Him, not doing thine own ways, nor finding thine own pleasure.” Isaiah 58:13. Nor does the prohibition end here. “Nor speaking thine own words,” says the prophet. Those who discuss business matters or lay plans on the Sabbath are regarded by God as though engaged in the actual transaction of business. To keep the Sabbath holy, we should not even allow our minds to dwell upon things of a worldly character. And the commandment includes all within our gates. The inmates of the house are to lay aside their worldly business during the sacred hours. All should unite to honor God by willing service upon His holy day. {PP 307.3}
Matthew 5:20-22, 27-28, 41
20 For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
21 Ye have heard that it was said of them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment:
27 Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
28 But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
41 And whosoever shall compel thee to go a mile, go with him twain.
42 Give to him that asketh thee, and from him that would borrow of thee turn not thou away.
43 Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy.
44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
In every one of those scriptures Jesus is telling His disciples to take the law one step further.
The Very Last Deception of Satan will be to Make of None Effect the Testimonies of the Spirit of God
Satan is … constantly pressing in the spurious—to lead away from the truth. The very last deception of Satan will be to make of none effect the testimony of the Spirit of God. “Where there is no vision, the people perish” (Proverbs 29:18). Satan will work ingeniously, in different ways and through different agencies, to unsettle the confidence of God’s remnant people in the true testimony.—Letter 12, 1890. {1SM 48.3}
There will be a hatred kindled against the testimonies which is satanic. The workings of Satan will be to unsettle the faith of the churches in them, for this reason: Satan cannot have so clear a track to bring in his deceptions and bind up souls in his delusions if the warnings and reproofs and counsels of the Spirit of God are heeded.—Letter 40, 1890. {1SM 48.4}