Analysis of For Who?

When the heavens with stars are gleaming
   Like a diadem of light,
And the moon’s pale rays are streaming,
   Decking earth with radiance bright;
When the autumn’s winds are sighing,
   O’er the hill and o’er the lea,
When the summer time is dying,
   Wanderer, wilt thou think of me?

When thy life is crowned with gladness,
     And thy home with love is blest,
Not one brow o’ercast with sadness,
     Not one bosom of unrest—
When at eventide reclining,
    At thy hearthstone gay and free,
Think of one whose life is pining,
    Breathe thou, love, a prayer for me.

Should dark sorrows make thee languish,
     Cause thy cheek to lose its hue,
In the hour of deepest anguish,
     Darling, then I’ll grieve with you.
Though the night be dark and dreary,
     And it seemeth long to thee,
I would whisper, “be not weary;”
   I would pray love, then, for thee.

Well I know that in the future,
    I may cherish naught of earth;
Well I know that love needs nurture,
    And it is of heavenly birth.
But though ocean waves may sever
     I from thee, and thee from me,
Still this constant heart will never,
    Never cease to think of thee.