The subject of the sanctuary was the key which unlocked the mystery of the disappointment, showing that God had led his people in the great Advent movement. It opened to view a complete system of truth, connected and harmonious, and revealed present duty as it brought to light the position and work of God's people. 4SP 268.1
After the passing of the time of expectation, in 1844, Adventists still believed the Saviour's coming to be very near; they held that they had reached an important crisis, and that the work of Christ as man's intercessor before God, had ceased. Having given the warning of the Judgment near, they felt that their work for the world was done, and they lost their burden of soul for the salvation of sinners, while the bold and blasphemous scoffing of the ungodly seemed to them another evidence that the Spirit of God had been withdrawn from the rejecters of his mercy. All this confirmed them in the belief that probation had ended, or, as they then expressed it, “the door of mercy was shut.” [See Appendix, note 6.] 4SP 268.2
But clearer light came with the investigation of the sanctuary question. Now was seen the application of those words of Christ in the Revelation, addressed to the church at this very time: “These things saith he that is holy, he that is true, he that hath the key of David, he that openeth and no man shutteth, and shutteth and no man openeth; I know thy works; behold, I have set before thee an open door, and no man can shut it.” [Revelation 3:7, 8.] Here an open as well as a shut door is brought to view. At the termination of the 2300 prophetic days in 1844, Christ changed his ministration from the holy to the most holy place. When, in the ministration of the earthly sanctuary, the high priest on the day of atonement entered the most holy place, the door of the holy place was closed, and the door of the most holy was opened. So, when Christ passed from the holy to the most holy of the heavenly sanctuary, the door, or ministration, of the former apartment was closed, and the door, or ministration, of the latter was opened. Christ had ended one part of his work as our intercessor, to enter upon another portion of the work; and he still presented his blood before the Father in behalf of sinners. “Behold,” he declares, “I have set before thee an open door, and no man can shut it.” 4SP 268.3
Those who by faith follow Jesus in the great work of the atonement, receive the benefits of his mediation in their behalf; but those who reject the light that brings to view this work of ministration, are not benefited thereby. The Jews who rejected the light given at Christ's first advent, and refused to believe in him as the Saviour of the world, could not receive pardon through him. When Jesus at his ascension entered by his own blood into the heavenly sanctuary to shed upon his disciples the blessings of his mediation, the Jews were left in total darkness, to continue their useless sacrifices and offerings. The ministration of types and shadows had ceased. That door by which men had formerly found access to God, was no longer open. The Jews had refused to seek him in the only way whereby he could then be found, through the ministration in the sanctuary in Heaven. Therefore they found no communion with God. To them the door was shut. They had no knowledge of Christ as the true sacrifice and the only mediator before God; hence they could not receive the benefits of his mediation. 4SP 269.1
The condition of the unbelieving Jews illustrates the condition of the careless and unbelieving among professed Christians, who are willingly ignorant of the work of our merciful High Priest. In the typical service, when the high priest entered the most holy place, all Israel were required to gather about the sanctuary, and in the most solemn manner humble their souls before God, that they might receive the pardon of their sins, and not be cut off from the congregation. How much more essential in this anti-typical day of atonement that we understand the work of our High Priest, and know what duties are required of us. 4SP 270.1
Men cannot with impunity reject the warnings which God in mercy sends them. A message was sent from Heaven to the world in Noah's day, and their salvation depended upon the manner in which they treated that message. Because they rejected the warning, the Spirit of God was withdrawn from that sinful race, and they perished in the waters of the flood. In the time of Abraham, mercy ceased to plead with the guilty inhabitants of Sodom, and all but Lot with his wife and two daughters were consumed by the fire sent down from heaven. So in the days of Christ. The Son of God declared to the unbelieving Jews of that generation, “Your house is left unto you desolate.” [Matthew 23:38.] Looking down to the last days, the same infinite power declares, concerning those who “received not the love of the truth, that they might be saved,” “For this cause God shall send them strong delusion, that they should believe a lie; that they all might be damned who believed not the truth, but had pleasure in unrighteousness.” [2 Thessalonians 2:10-12.] As they reject the teachings of his word, God withdraws his Spirit, and leaves them to the deceptions which they love. 4SP 270.2
But Christ still intercedes in man's behalf, and light will be given to those who seek it. Though this was not at first understood by Adventists, it was afterward made plain as the scriptures which define their true position began to open before them. 4SP 271.1
The passing of the time in 1844 was followed by a period of great trial to those who still held the Advent faith. Their only relief, so far as ascertaining their true position was concerned, was the light which directed their minds to the sanctuary above. As has been stated, Adventists were for a short time united in the belief that the door of mercy was shut. This position was soon abandoned. Some renounced their faith in their former reckoning of the prophetic periods, and ascribed to human or Satanic agencies the powerful influence of the Holy Spirit which had attended the Advent movement. Another class firmly held that the Lord had led them in their past experience; and as they waited and watched and prayed to know the will of God, they saw that their great High Priest had entered upon another work of ministration, and, following him by faith, they were led to understand also the closing work of the church, and were prepared to receive and give to the world the warning of the third angel of Revelation 14. 4SP 271.2