Petrarch, Il Canzoniere, #62.

  1     Heavenly Father, after the lost days,
  2     after the nights spent wandering,
  3     with that fierce desire that burned in my heart,
  4     gazing on limbs so adorned as to do me harm,
  5     now may it please you by Your light that I turn
  6     to the greater life and more beautiful work,
  7     so that my harsh adversary having cast
  8     his nets in vain, may be discredited.
  9     Now, my Lord, the eleventh year revolves
 10     since I was bowed under the pitiless yoke,
 11     which to those most subject to it is most fierce.
 12     Have pity on my unworthy suffering:
 13     lead back my wandering thoughts to a better place:
 14     remind them how you hung, today, upon the cross.

7-8: "so that my harsh adversary having cast / his nets in vain": — The usual interpretation of "harsh adversary" is "satan," and of "his nets," "the traps of sin."

14: "today": — Good Friday, eleven years after the Good Friday on which Petrarch first saw Laura.