I know that this was Life,--the track
  Whereon with equal feet we fared;
  And then, as now, the day prepared
The daily burden for the back.

But this it was that made me move
  As light as carrier-birds in air;
  I loved the weight I had to bear,
Because it needed help of Love:

Nor could I weary, heart or limb,
  When mighty Love would cleave in twain
  The lading of a single pain,
And part it, giving half to him.