What are a friend's books for if not to be borrowed?

People think there's a choice between smoking and immortality, but we've all got to die of something.

Your opinions are your symptoms.

You can't treat royalty like people with normal perverted desires.

Rosencrantz: Shouldn't we be doing something--constructive? Guildenstern: What did you have in mind? ... A short, blunt human pyramid...?

A Chinaman of the T'ang Dynasty—and, by which definition, a philosopher—dreamed he was a butterfly, and from that moment he was never quite sure that he was not a butterfly dreaming it was a Chinese philosopher. Envy him; in his two-fold security.

I don't think Stoppardian has a precise definition.