Here's a sample taken from part 4:
Today, there are many sincere Christians who are keeping the wrong day for the right reason.  Do you know that? We have made the Sunday/Sabbath issue an issue between Sunday-keeping Christians and Sabbath-keeping Christians. That’s not the issue.  The issue is between the church which is the body of Christ and the world which is under Satan.  But today there is confusion. 
There are many millions of Christians who are keeping the wrong day but for the right reason.  They are resting in God’s provision in Jesus Christ, but they are keeping the wrong day.  They don’t realize it.
  Likewise, others, equally sincere, are keeping the right day for the wrong reason.  Many are keeping the Sabbath, hoping that it will take them to heaven.  Keeping the day won’t take anyone to heaven because nobody keeps the Sabbath so strictly as the Jews.  They are very meticulous.  I’m talking of the orthodox Jew.
But before the end comes the true gospel of righteousness by faith will be restored and preached for a witness.  In other words, when the true gospel is preached in all its clarity there will be no more confusion.  Then every person, Christian and non-Christian, will have to make a choice between life and death, between God and Satan, between the kingdom of God and the kingdom of this world.  There will be no confusion then.  That’s the direction we need to point in.  We need to lay the foundation because when the issue comes, Sister [Ellen G.] White says in Great Controversy that the arguments have already been presented but now they see it, and they take their stand.  Thousands will join the Sabbath-keepers because they were sincere in resting in Christ although keeping the wrong day.  And thousands who belong to the right day will join the other camp because they were keeping it for the wrong reason.  So there is going to be an exchange and we know that it is going to come.
  So the fundamental issue is between righteousness by faith and righteousness by works.  I have some very strong statements from the Spirit of Prophecy but I would like to remind you of a statement I have in the back of my Bible which is dealing indirectly with this issue.  We are told that, “When the end comes, only one truth will prevail, one interest will prevail, one subject will swallow up every other—Christ Our Righteousness.” Review and Herald Extra, 23 December 1890.
  When that happens, every human being will have to take a stand.  At that time, the Sabbath will point to resting in God and Sunday will be pointing to resting in man.  It is not the Sunday-keeping Christians who will make the Sunday law.  It is the world who will make the Sunday law.  It is true that apostate Christianity will give them all the encouragement but it is the world that will make the decision.  They will say that Sunday has to be kept.  When this happens the two concepts of salvation will polarize and will be in conflict again like it was in the New Testament. 
At that time, the Sabbath will become the seal of God or righteousness by faith in contradiction to Sunday which is the mark of the beast.  The beast is simply an agent for the dragon, who is Satan.  Satan gives power to the beast.  So the real boss of the world is Satan.  The great controversy will come into focus in a final conflict between these two groups.
  What will Sabbath represent and what will Sunday represent? The Sabbath will represent “saved in Christ.” Sunday will represent “unbelief in Christ”—a deliberate, wilful rejection of God’s grace.
  When the Sunday law is established, it will signify mankind’s deliberate and wilful rejection of God’s saving grace in Christ.  This is the abomination that maketh desolate.  We know that the earth will be desolate.  What is it that makes it desolate? The abomination.