"“Mysterious Rapping” August 24, 1850, I saw that the “mysterious rapping” was the power of Satan; some of it was directly from him, and some indirectly, through his agents, but it all proceeded from Satan. It was his work that he accomplished in different ways; yet many in the churches and the world were so enveloped in gross darkness that they thought and held forth that it was the power of God. Said the angel, “Should not a people seek unto their God? for the living to the dead?” Should the living go to the dead for knowledge? The dead know not anything. For the living God do ye go to the dead? They have departed from the living God to converse with the dead who know not anything. (See Isaiah 8:19, 20 .). EW 59"
"And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? for the living to the dead?"
EGW directly quotes Isaiah 8:19 and references Isaiah 8:20 in the passage, making the connection explicit. The context of both passages is seeking guidance from the living God rather than from the dead.
and mesmerism these modern magicians would yet account for all the miracles wrought by our Lord Jesus Christ, and that many would believe that all the mighty works of the Son of God when on earth were accomplished by this same power. [When this view was given, spiritualism had but just arisen and was small; there were but few mediums. Since that time it has spread all over the world and counts its adherents by many millions. As a general thing, spiritualists have denied the Bible and derided Christianity. Individuals have, at different times, deplored this and protested against it, but they were so few that no attention was paid to them. Now spiritualists are changing their method, and many call themselves “Christian spiritualists,” Declaring that it will not answer to ignore religion, and affirming that they have the true Christian faith. Bearing in mind, also, that many prominent clergymen are in sympathy with spiritualism, we now see the way open for the complete fulfillment of this…
"For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect."
Both passages warn of deception through signs and wonders. Matthew 24:24 speaks of false Christs and prophets performing great signs, while EGW discusses spiritualism and its potential to deceive, even to the point of explaining away Christ's miracles. The underlying theme of deceptive signs and wonders is present in both.