Sin is cruelty and injustice, all else is peccadillo. Oh, a sense of sin comes from violating the customs of your tribe. But breaking custom is not sin even when it feels so; sin is wronging another person.
Robert A. HeinleinSpacemen - men who work in space, pilots and jetmen and astrogators and such - are men who like a few million miles of elbow room.
Robert A. Heinlein