"One is a prophecy; the other a revelation. The book that was sealed is not the Revelation, but that portion of the prophecy of Daniel relating to the last days. The angel commanded, “But thou, O Daniel, shut up the words, and seal the book, even to the time of the end.” Daniel 12:4 . AA 585.1"
"But thou, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased."
Ellen White directly references Daniel 12:4 in this passage.
It was Christ who bade the apostle record that which was to be opened before him. “What thou seest, write in a book,” He commanded, “and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.” “I am He that liveth, and was dead; and, behold, I am alive for evermore.... Write the things which thou hast seen, and the things which are, and the things which shall be hereafter; the mystery of the seven stars which thou sawest in My right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches: and the seven candlesticks which thou sawest are the seven churches.” Revelation 1:11, 18-20 . AA 585.2 The names of the seven churches are symbolic of the church in different periods of the Christian Era. The number 7 indicates completeness, and is symbolic of the fact that the messages extend to the end of time, while the symbols used revea…
"Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea."
The EGW passage directly quotes Revelation 1:11, making it a clear and explicit allusion.