What IS sin? “Sin is…selfishness.” High School Classmate, Christine Conser, in observing our cultural and personal dilemmas, c. 1980. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like Loading... Related Author: Living Letters Community Writer-speaker sharing some Inspirations I've received and INJoyed...and want to encourage YOU with. View all posts by Living Letters Community