The law/sabbath: CW 30, 31
The faith of Jesus: CW 30, 31
The personalities of God and Christ: YRP 235
The Sanctuary: GC 409
The non-immortality of the wicked: CW 30, 31
The three angel's messages: CW 30, 31
The testimony of Jesus: 1T 300
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I am going over them..
The law/sabbath: CW 30, 31
The faith of Jesus: CW 30, 31
The personalities of God and Christ: YRP 235
The Sanctuary: GC 409
The non-immortality of the wicked: CW 30, 31
The three angel's messages: CW 30, 31
The testimony of Jesus: 1T 300
Here is what 'CW 30, 31' Counsels to Writers and Editors has..
The Landmarks Defined—In Minneapolis God gave precious gems of truth to His people in new settings. This light from heaven by some was rejected with all the stubbornness the Jews manifested in rejecting Christ, and there was much talk about standing by the old landmarks. But there was evidence they knew not what the old landmarks were. There was evidence and there was reasoning from the word that commended itself to the conscience; but the minds of men were fixed, sealed against the entrance of light, because they had decided it was a dangerous error removing the “old landmarks” when it was not moving a peg of the old landmarks, but they had perverted ideas of what constituted the old landmarks.
The passing of the time in 1844 was a period of great events, opening to our astonished eyes the cleansing of the sanctuary transpiring in heaven, and having decided relation to God’s people upon the earth, [also] the first and second angels’ messages and the third, unfurling the banner on which was inscribed, “The commandments of God and the faith of Jesus.” One of the landmarks under this message was the temple of God, seen by His truth-loving people in heaven, and the ark containing the law of God. The light of the Sabbath of the fourth commandment flashed its strong rays in the pathway of the transgressors of God’s law. The nonimmortality of the wicked is an old landmark. I can call to mind nothing more that can come under the head of the old landmarks. All this cry about changing the old landmarks is all imaginary.
Now at the present time God designs a new and fresh impetus shall be given to His work. Satan sees this, and he is determined it shall be hindered. He knows that if he can deceive the people who claim to believe present truth, [and make them believe that] the work the Lord designs to do for His people is a removing of the old landmarks, something which they should, with most determined zeal, resist, then he exults over the deception he has led them to believe. The work for this time has certainly been a surprising work of various hindrances, owing to the false setting of matters before the minds of many of our people. That which is food to the churches is regarded as dangerous, and should not be given them. And this slight difference of ideas is allowed to unsettle the faith, to cause apostasy, to break up unity, to sow discord, all because they do not know what they are striving about themselves. Brethren, is it not best to be sensible? Heaven is looking upon us all, and what can they think of recent developments? While in this condition of things, building up barriers, we not only deprive ourselves of great light and precious advantages, but just now, when we so much need it, we place ourselves where light cannot be communicated from heaven that we ought to communicate to others.—Manuscript 13, 1889.
Let Pioneers Identify Truth—When the power of God testifies as to what is truth, that truth is to stand forever as the truth. No aftersuppositions, contrary to the light God has given are to be entertained. Men will arise with interpretations of Scripture which are to them truth, but which are not truth. The truth for this time, God has given us as a foundation for our faith. He Himself has taught us what is truth. One will arise, and still another, with new light which contradicts the light that God has given under the demonstration of His Holy Spirit.
A few are still alive who passed through the experience gained in the establishment of this truth. God has graciously spared their lives to repeat and repeat till the close of their lives, the experience through which they passed even as did John the apostle till the very close of his life. And the standard-bearers who have fallen in death, are to speak through the reprinting of their writings. I am instructed that thus their voices are to be heard. They are to bear their testimony as to what constitutes the truth for this time.
We are not to receive the words of those who come with a message that contradicts the special points of our faith. They gather together a mass of Scripture, and pile it as proof around their asserted theories. This has been done over and over again during the past fifty years. And while the Scriptures are God’s word, and are to be respected, the application of them, if such application moves one pillar from the foundation that God has sustained these fifty years, is a great mistake. He who makes such an application knows not the wonderful demonstration of the Holy Spirit that gave power and force to the past messages that have come to the people of God.—Preach the Word, p. 5 (1905).
Here is what 'YRP 235' Ye Shall Receive Power has..
And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone. Ephesians 2:20.
Let not any man enter upon the work of tearing down the foundations of the truth that have made us what we are. God has led His people forward step by step though there were pitfalls of error on every side. Under the wonderful guidance of a plain, “Thus saith the Lord,” a truth has been established that has stood the test of trial. When men arise and attempt to draw away disciples after them, meet them with the truths that have been tried as by fire.
“And unto the angel of the church in Sardis write: These things saith he that hath the seven Spirits of God, and the seven stars; I know thy works, that thou hast a name that thou livest, and art dead. Be watchful, and strengthen the things which remain, that are ready to die: for I have not found thy works perfect before God. Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee” (Revelation 3:1-3).
Those who seek to remove the old landmarks are not holding fast; they are not remembering how they have received and heard. Those who try to bring in theories that would remove the pillars of our faith concerning the sanctuary or concerning the personality of God or of Christ are working as blind men. They are seeking to bring in uncertainties and to set the people of God adrift without an anchor.
Those who claim to be identified with the message that God has given us should have keen, clear spiritual perceptions, that they may distinguish truth from error. The word spoken by the messenger of God is “Wake up the watchmen.” If men will discern the spirit of the messages given and strive to find out from what source they come, the Lord God of Israel will guard them from being led astray.—Manuscript Release 760:9, 10.
Here is what 'GC 409/410' Great Controversy has... (under Chapter 23: What Is the Sanctuary?)
The scripture which above all others had been both the foundation and the central pillar of the advent faith was the declaration: "Unto two thousand and three hundred days; then shall the sanctuary be cleansed." Daniel 8:14. These had been familiar words to all believers in the Lord's soon coming. By the lips of thousands was this prophecy repeated as the watchword of their faith. All felt that upon the events therein foretold depended their brightest expectations and most cherished hopes. These prophetic days had been shown to terminate in the autumn of 1844. In common with the rest of the Christian world, Adventists then held that the earth, or some portion of it, was the sanctuary. They understood that the cleansing of the sanctuary was the purification of the earth by the fires of the last great day, and that this would take place at the second advent. Hence the conclusion that Christ would return to the earth in 1844.
But the appointed time had passed, and the Lord had not appeared. The believers knew that God's word could not fail; their interpretation of the prophecy must be at fault; but where was the mistake? Many rashly cut the knot of difficulty by denying that the 2300 days ended in 1844. No reason could be given for this except that Christ had not come at the time they expected Him. They argued that if the prophetic days had ended in 1844, Christ would then have returned to [410] cleanse the sanctuary by the purification of the earth by fire; and that since He had not come, the days could not have ended.
To accept this conclusion was to renounce the former reckoning of the prophetic periods. The 2300 days had been found to begin when the commandment of Artaxerxes for the restoration and building of Jerusalem went into effect, in the autumn of 457 B.C. Taking this as the starting point, there was perfect harmony in the application of all the events foretold in the explanation of that period in Daniel 9:25-27. Sixty-nine weeks, the first 483 of the 2300 years, were to reach to the Messiah, the Anointed One; and Christ's baptism and anointing by the Holy Spirit, A.D. 27, exactly fulfilled the specification. In the midst of the seventieth week, Messiah was to be cut off. Three and a half years after His baptism, Christ was crucified, in the spring of A.D. 31. The seventy weeks, or 490 years, were to pertain especially to the Jews. At the expiration of this period the nation sealed its rejection of Christ by the persecution of His disciples, and the apostles turned to the Gentiles, A.D. 34. The first 490 years of the 2300 having then ended, 1810 years would remain. From A.D. 34, 1810 years extend to 1844. "Then," said the angel, "shall the sanctuary be cleansed." All the preceding specifications of the prophecy had been unquestionably fulfilled at the time appointed.
With this reckoning, all was clear and harmonious, except that it was not seen that any event answering to the cleansing of the sanctuary had taken place in 1844. To deny that the days ended at that time was to involve the whole question in confusion, and to renounce positions which had been established by unmistakable fulfillments of prophecy.
In their investigation they learned that there is no Scripture evidence sustaining the popular view that the earth is the sanctuary; but they found in the Bible a full explanation of the subject of the sanctuary, its nature, location, and services; the testimony of the sacred writers being so...
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Here is what '1T 300' Testimonies vol 1 page 300 has...
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The only safety now is to search for the truth as revealed in the word of God, as for hid treasure. The subjects of the Sabbath, the nature of man, and the testimony of Jesus are the great and important truths to be understood; these will prove as an anchor to hold God's people in these perilous times. But the mass of mankind despise the truths of God's word and prefer fables. 2 Thessalonians 2:10, 11: "Because they received not the love of the truth, that they might be saved. And for this cause God shall send them strong delusion, that they should believe a lie."
The most licentious and corrupt are highly flattered by these Satanic spirits, which they believe to be the spirits of their dead friends, and they are vainly puffed up in their fleshly minds. Colossians 2:19: "And not holding the Head, from which all the body by joints and bands having nourishment ministered, and knit together, increaseth with the increase of God," they deny Him who ministers strength to the body, that every member may increase with the increase of God.
Vain philosophy. The members of the body are controlled by the head. Spiritualists lay aside the Head and believe that all the members of the body must act themselves and that fixed laws will lead them on in a state of progression to perfection without a head. John 15:1, 2, 4-6: "I am the True Vine, and My Father is the Husbandman. Every branch in Me that beareth not fruit, He taketh away: and every branch that beareth fruit, He purgeth it, that it may bring forth more fruit." "Abide in Me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in Me. I am the Vine, ye are the branches: He that abideth in Me, and I in him, the same bringeth forth much fruit: for without Me ye can do nothing. If a man abide not in Me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned."