"but of all the worlds that He had created; and Satan thought that if he could carry the angels of heaven with him in rebellion, he could carry also the other worlds. He had artfully presented his side of the question, employing sophistry and fraud to secure his objects. His power to deceive was very great, and by disguising himself in a cloak of falsehood he had gained an advantage. Even the loyal angels could not fully discern his character or see to what his work was leading. GC 497.1"
"And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him."
The EGW passage elaborates on Satan's deception and influence, aligning with Revelation 12:9's description of Satan as the deceiver of the whole world and the casting out of his angels.