I stood in Venice on the Bridge of Sighs,

A palace and a prison on each hand.

Lord Byron 1788-1824: Childe Harold's Pilgrimage. Canto iv. Stanza 1.

Stone walls do not a prison make,

Nor iron bars a cage;

Minds innocent and quiet take

That for an hermitage;

If I have freedom in my love,

And in my soul am free,

Angels alone that soar above

Enjoy such liberty.

Richard Lovelace (1618-1658): To Althea from Prison, iv.

I am thy father's spirit,

Doom'd for a certain term to walk the night,

And for the day confin'd to fast in fires,

Till the foul crimes done in my days of nature

Are burnt and purg'd away. But that I am forbid

To tell the secrets of my prison-house,

I could a tale unfold, whose lightest word

Would harrow up thy soul, freeze thy young blood,

Make thy two eyes, like stars, start from their spheres,

Thy knotted and combined locks to part

And each particular hair to stand an end,

Like quills upon the fretful porpentine:

But this eternal blazon must not be

To ears of flesh and blood. List, list, O, list!

William Shakespeare (1564-1616): Hamlet. Act i. Sc. 5.