7. The Witch and Satan Had an Agreement—The witch of Endor had made agreement with Satan to follow his directions in all things; and he would perform wonders and miracles for her, and would reveal to her the most secret things, if she would yield herself unreservedly to be controlled by his Satanic majesty. This she had done (The Spirit of Prophecy 1:375, 376).
(2BC 1022.7)
8-19. Saul′s Final Step—When Saul inquired for Samuel, the Lord did not cause Samuel to appear to Saul. He saw nothing. Satan was not allowed to disturb the rest of Samuel in the grave, and bring him up in reality to the witch of Endor. God does not give Satan power to resurrect the dead. But Satan′s angels assume the form of dead friends, and speak and act like them, that through professed dead friends he can the better carry on his work of deception. Satan knew Samuel well, and he knew how to represent him before the witch of Endor, and to utter correctly the fate of Saul and his sons.
(2BC 1022.8)
Satan will come in a very plausible manner to such as he can deceive, and will insinuate himself into their favor, and lead them almost imperceptibly from God. He wins them under his control, cautiously at first, until their perceptibilities become blunted. Then he will make bolder suggestions, until he can lead them to commit almost any degree of crime. When he has led them fully into his snare, he is then willing that they should see where they are, and he exults in their confusion, as in the case of Saul. He had suffered Satan to lead him a willing captive, and now Satan spreads before Saul a correct description of his fate. By giving Saul a correct statement of his end, through the woman of Endor, Satan opens a way for Israel to be instructed by his satanic cunning, that they may, in their rebellion against God, learn of him, and by thus doing, sever the last link which would hold them to God.
(2BC 1022.9)
Saul knew that in this last act, of consulting the witch of Endor, he cut the last shred which held him to God. He knew that if he had not before wilfully separated himself from God, this act sealed that separation, and made it final. He “had made an agreement with death, and a covenant with hell”(Isaiah 28:15). The cup of his iniquity was full (The Spirit of Prophecy 1:376, 377).
(2BC 1023.1)