Song from "The Indian Emperor" (I look'd, and saw within the book of fate)

I look'd, and saw within the book of fate,
When many days did lour,
When lo! one happy hour
Leap'd up, and smiled to save the sinking state;
A day shall come when in thy power
Thy cruel foes shall be;
Then shall thy land be free:
And then in peace shall reign;
But take, O take that opportunity,
Which, once refused, will never come again.