When Satan became fully conscious that there was no possibility of his being brought again into favor with God, his malice and hatred began to be manifest. He consulted with his angels, and a plan was laid to still work against God's government. When Adam and Eve were placed in the beautiful garden, Satan was laying plans to destroy them. In no way could this happy couple be deprived of their happiness if they obeyed God. Satan could not exercise his power upon them unless they should first disobey God and forfeit His favor. Some plan must therefore be devised to lead them to disobedience that they might incur God's frown and be brought under the more direct influence of Satan and his angels. It was decided that Satan should assume another form and manifest an interest for man. He must insinuate against God's truthfulness and create doubt whether God did mean just what He said; next, he must excite their curiosity, and lead them to pry into the unsearchable plans of God—the very sin of…
"Now the serpent was more subtil than any beast of the field which the Lord God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?"
The EGW passage directly references and expands upon the events described in Genesis 3:1, including the serpent's subtlety and questioning of God's word.