Analysis of Written on a Wall at Woodstock

Oh Fortune, thy wresting wavering state
Hath fraught with cares my troubled wit,
Whose witness this present prison late
Could bear, where once was joy's loan quit.
Thou causedst the guilty to be loosed
From bands where innocents were inclosed,
And caused the guiltless to be reserved,
And freed those that death had well deserved.
But all herein can be nothing wrought,
So God send to my foes all they have thought.