 Satan wants to distract us from thinking and thanking God for all of the provisions he's given us into the things that are forbidden. He did that with Eve. And he said in Genesis 3, 5, the reason God doesn't want you to eat of that tree, for he knows that in the day you eat of it, your eyes will be opened and you will be like God, knowing good and evil. Covetousness, a dissatisfaction with what God has already provided us.