FEEL FREE

"Feel Free" is a cryptic statement spoken by one Implementor to another Implementor when offering suggestions for changes in the world. It has no significance to mortals other than the fact that both words begin with an "F".

TRIVIA:
This mystical phrase has been inscribed within both the Crypt of the Implementors and the Crypt of Death.

SOURCE(S): Dungeon, Zork I