In the desert there is no sign that says, Thou shalt not eat stones. — Sufi proverb - Margaret Atwood

What Elizabethan playwrights learned from the Greek classics was not theories of insanity, but dramatic practice — that is, madness is a dandy theatrical element. It focuses the audience's attention and increases suspense, since you never know what a mad person may get up to next; and Shakespeare himself makes use of it in many forms. In King Lear, there's a scene in which one man pretending to be mad, another who has really gone mad, and a third who has probably always been a little addled, are brought together for purposes of comparison, irony, pathos, and tour de force acting. In Hamlet, there are two variations — Hamlet himself, who assumes madness, and Ophelia, who really does go winsomely bonkers. In MacBeth, it's Lady MacBeth who snaps.

Neither of us says the word love, not once. It would be tempting fate; it would be romance, bad luck.

As all historians know, the past is a great darkness, and filled with echoes. Voices may reach us from it; but what they say to us is imbued with the obscurity of the matrix out of which they come; and try as we may, we cannot always decipher them precisely in the clearer light of our day.