A. E. Housman (1859–1936).  A Shropshire Lad.  1896.

IF it chance your eye offend you,
  Pluck it out, lad, and be sound:
’Twill hurt, but here are salves to friend you,
  And many a balsam grows on ground.

And if your hand or foot offend you,         
  Cut it off, lad, and be whole;
But play the man, stand up and end you,
  When your sickness is your soul.