• Nor stony tower, nor walls of beaten brass, Nor airless dungeon, nor strong links of iron, Can be retentive to the strength of spirit; But life, being weary of these worldly bars, Never lacks power to dismiss itself.

    William Shakespeare: Nor stony tower, nor walls of beaten brass,
Nor airless dungeon, nor strong links of iron,
Can be retentive to the strength of spirit;
But life, being weary of these worldly bars,
Never lacks power to dismiss itself.
    'Julius Caesar' (1599) act 1, sc. 3, l. 93