Classic Poem

‘Most horrid sounds and sights you'll hear and see,
  Which might the lion-hearted terrify,
 But on your part let perfect silence be;
  All unconcerned your labors earnest ply,
 Whatever fills your ear, or meets your eye;
  The golden treasures are by silence won;
 And should you speak, you'll know the reason why.
  Keep all a secret—tell it unto none;
And now depart from hence, and see that all is done.’