God would not leave Adam and Eve destitute. The promise God made in this chapter is called the proto-evangel, the first prophecy of the Messiah. Understanding Who the Messiah would be, and what He would do, was going to slowly unfold throughout the Old Testament. Then, throughout the New Testament, Who Jesus is and what He has done is revealed.
The woman must have felt both the strong pull of the Tree itself, and her own fascination with the secret promises it seemed to hold. Temptation had found a hook in her heart, and the pull was strong. To combat its magnetic draw, the woman drew from God’s words for help. But the words she held onto were not simply God’s words, but an added word. To God’s Law had been added something a little extra. Oral Law.
Eden was luscious because God had carefully designed and planted it Himself. Now God gave adam, the human being, this exquisite Garden, along with a purpose and responsibility: adam was to continue in the work God had started, cultivating and sustaining the beauty of Eden.