Adam and Eve wanted their eyes to be opened, to be like God, and know both good and evil (Gen. 3:15). Adam and Eve gave into temptation.
When the woman saw that the tree was good for food,
and that it was a delight to their eyes, and that the tree
was desirable to make one wise, she took from its fruit
and ate; she gave also to her husband with her, and she
ate (Gen. 3:6).
They desired knowledge. Knowledge was there folly. Satan uses our weakness to accomplish his plans.