Quick Quotes on Sin
 

"Sin cannot be committed unless laws are ordained (Alma 42:17) and unless people have knowledge of those laws so that they can violate them. Adam and Eve could not commit sin while in the Garden of Eden, although laws of conduct had already been established, because the knowledge of good and evil had not yet been given them. Unless they had partaken of the fruit of the tree of the knowledge of good and evil "they would have remained in a state of innocence, having no joy, for they knew no misery; doing no good, for they knew no sin."  (2 Nephi 2:23.)  -Bruce R. McConkie, Mormon Doctrine, pg. 735