There is a satirical phrase, "Everything not forbidden is compulsory," which seems to have been a part of popular culture (in varied form) in the English-speaking world in the early 20th century. It was later used by Murray Gell-Mann as a tongue-in-cheek way of formulating a fundamental principle of quantum mechanics. In the physics context, it's referred to as the "totalitarian principle." I ran across a comment on a WP talk page saying that Heinlein uses this phrase in the 1940 story "Coventry." Can anyone help me track down where in the story it occurs? It's a pretty long story. What I have handy is the 1967 Berkley mass-market paperback edition of The Past Through Tomorrow, but if anyone can point me to the general location within the story, I should be able to find it.