Duties are not performed for duty's sake, but because their neglect would make the man uncomfortable. A man performs but one duty - the duty of contenting his spirit, the duty of making himself agreeable to himself.
It was not that Adam ate the apple for the apple's sake, but because it was forbidden. It would have been better for us-oh infinitely better for us-if the serpent had been forbidden
Adam did not want the apple for the apple's sake; he wanted it because it was forbidden.