From the second scene in the second act of Hamlet, by William Shakespeare, rewritten a little for clarity, in modern language:
Hamlet: Denmark’s a prison.
Rosencrantz: If it is, then the world’s one, too.
Hamlet: And quite a prison, in which there are many wards, dungeons, and places to be confined, one of which is Denmark.
Roscencrantz: That’s not how we think of it, your highness.
Hamlet: Well, then, for you, it isn’t. For nothing is either good or bad but thinking makes it so. But to me, it’s a prison.