William Shakespeare, Sonnet cxxxiii
Beshrew that heart that makes my heart to groan 
For that deep wound it gives my friend and me! 
Is't not enough to torture me alone, 
4
But slave to slavery my sweet'st  friend must be? 
Me from myself thy cruel eye has taken, 
And my next self thou harder hast engross'd ; 
Of him, myself, and thee, I am forsaken; 
8
A torment thrice three-fold thus to be cross'd . 
Prison my heart in thy steel bosom's ward, 
But then my friend's heart let my poor heart bail; 
12
Thou canst not then use rigour in my gaol: 
And yet thou wilt; for I, being pent in thee, 
Perforce am thine, and all that is in me.