Sequel

This world is not conclusion;
  A sequel stands beyond,
Invisible, as music,
  But positive, as sound.
It beckons and it baffles;         5
  Philosophies don’t know,
And through a riddle, at the last,
  Sagacity must go.
To guess it puzzles scholars;
  To gain it, men have shown         10
Contempt of generations,
  And crucifixion known.