"The enemy is preparing for his last campaign against the church. He has so concealed himself from view that many can hardly believe that he exists, much less can they be convinced of his amazing activity and power. They have to a great extent forgotten his past record; and when he makes another advance move, they will not recognize him as their enemy, that old serpent, but they will consider him a friend, one who is doing a good work. Boasting of their independence they will, under his specious, bewitching influence, obey the worst impulses of the human heart and yet believe that God is leading them. Could their eyes be opened to distinguish their captain, they would see that they are not serving God, but the enemy of all righteousness. They would see that their boasted independence is one of the heaviest fetters Satan can rivet on unbalanced minds. 5T 294.1"
"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."
EGW directly refers to Satan as "that old serpent," a clear allusion to Revelation 12:9.