"God has given man six days in which to work for himself, but He has reserved one day in which He is to be specially honored. He is to be glorified, His authority respected. And yet man will rob God by stealing a little of the time which the Creator has reserved for Himself. God reserved the seventh day as a period of rest for man, for the good of man as well as for His own glory. He saw that the wants of man required a day of rest from toil and care, that his health and life would be endangered without a period of relaxation from the labor and anxiety of the six days. 1T 532.1"
"Six days shalt thou labour, and do all thy work: But the seventh day is the sabbath of the Lord thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:"
The EGW passage directly echoes the principle of working six days and resting on the seventh, as stated in Exodus 20:9-10. It also expands on the purpose of the Sabbath as a time for rest and honoring God.