[tmorton]

TLDR: The first stanza, not necessarily the second:

  Turning and turning in the widening gyre   
  The falcon cannot hear the falconer;
  Things fall apart; the centre cannot hold;
  Mere anarchy is loosed upon the world,
  The blood-dimmed tide is loosed, and everywhere   
  The ceremony of innocence is drowned;
  The best lack all conviction, while the worst   
  Are full of passionate intensity.

  Surely some revelation is at hand;
  Surely the Second Coming is at hand.   
  The Second Coming! Hardly are those words out   
  When a vast image out of Spiritus Mundi
  Troubles my sight: somewhere in sands of the desert   
  A shape with lion body and the head of a man,   
  A gaze blank and pitiless as the sun,   
  Is moving its slow thighs, while all about it   
  Reel shadows of the indignant desert birds.   
  The darkness drops again; but now I know   
  That twenty centuries of stony sleep
  Were vexed to nightmare by a rocking cradle,   
  And what rough beast, its hour come round at last,   
  Slouches towards Bethlehem to be born?

https://www.poetryfoundation.org/poems/43290/the-second-comi...