Genesis 2:16-17

Genesis 2:16-17 And the LORD God commanded the man, saying, “You may surely eat of every tree of the garden, but of the tree of the knowledge of good and evil you shall not eat, for in the day that you eat of it you shall surely die.”

God alone knows what is good for human beings and God alone knows what is not good for them. To enjoy the "good" we must trust God and obey him. If we disobey, we will have to decide for ourselves what is good and what is not good. While to modern men and women such a prospect may seem desirable, to the author of Genesis it is the worst fate that could have befallen humanity.

(John Sailhamer)