Cain spread the oath he made with Satan and the curse is disobedience to God by willful choice. (religion.blogs.cnn.com)
No «all» of any group is always making willful choices that get them into certain predicaments. (nakedpastor.com)
Without freedom and willful choice there is no sin; yet such freedom and willfulness can be exercised negatively as well as positively, becoming moral insensitiveness of the most devastating and unchristian nature. (religion-online.org)