Eve saw that the fruit of the tree appeared good to eat. It looked very attractive. She really wanted it so she could become wise. So she took some of its fruit and ate it, and she gave some to her husband, who was with her, and he ate it too.
The Lord accepted the sacrifice, and said to himself, “I won't ever again curse the ground because of human beings, even though every single thought in their minds is evil from childhood. I won't ever destroy all life again as I have just done.
David sent messengers to fetch her. When she came to him, he had sex with her. (Now she had just purified herself from having her period.) Afterwards she went back home.
He is feeding on ashes, seduced by the deceptive thinking of his mind. He can't save himself, and he doesn't even ask, “Isn't this idol I'm holding just a lie?”
Now would something that is good kill me? Of course not! But sin shows itself to be sin by using good to cause my death. So by means of the commandment, it's revealed how evil sin really is.