the work of Christ as man's intercessor before God had ceased. It appeared to them to be taught in the Bible that man's probation would close a short time before the actual coming of the Lord in the clouds of heaven. This seemed evident from those scriptures which point to a time when men will seek, knock, and cry at the door of mercy, and it will not be opened. And it was a question with them whether the date to which they had looked for the coming of Christ might not rather mark the beginning of this period which was immediately to precede His coming. 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while the bold and blasphemous scoffing of the ungodly seemed to them another evidence that the Spirit of God had been withdrawn from the rejecters of His mercy.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 wa…
"And while they went to buy, the bridegroom came; and they that were ready went in with him to the marriage: and the door was shut."
The EGW passage directly references the concept of a closed door of mercy and alludes to scriptures about seeking and knocking when it's too late. Matthew 25:10, with the shut door, is a clear parallel, even if not a direct quote.
"But clearer light came with the investigation of the sanctuary question. They now saw that they were correct in believing that the end of the 2300 days in 1844 marked an important crisis. But while it was true that that door of hope and mercy by which men had for eighteen hundred years found access to God, was closed, another door was opened, and forgiveness of sins was offered to men through the intercession of Christ in the most holy. One part of His ministration had closed, only to give place to another. There was still an “open door” to the heavenly sanctuary, where Christ was ministering in the sinner's behalf. GC 429.2"
"I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name."
EGW uses the concept of an 'open door' in the context of Christ's ministry in the heavenly sanctuary, which echoes the imagery of Revelation 3:8, where Jesus speaks of setting before the church an open door that no one can shut. The connection is thematic and relevant to the sanctuary doctrine.