Analysis of Song (Untitled #5)

I cannot lose thee for a day,
But like a bird with restless wing
My heart will find thee far away,
And on thy bosom fall and sing,
My nest is here, my rest is here; -
And in the lull of wind and rain,
Fresh voices make a sweet refrain,
'His rest is there, his nest is there.'

With thee the wind and sky are fair,
But parted, both are strange and dark;
And treacherous the quiet air
That holds me singing like a lark,
O shield my love, strong arm above!
Till in the hush of wind and rain,
Fresh voices make a rich refrain,
'The arm above will shield thy love.'