No More Learning

So when I see this robin now,
Like a red apple on the bough,
And question           why he sings so strong,
For love, or for the love of song;
Or sings, maybe, for that sweet rill
Whose silver tongue is never still--

Ah, now there comes this thought unkind,
Born of the knowledge in my mind:
He sings in triumph that last night
He killed his father in a fight;
And now he'll take his mother's blood--
The last strong rival for his food.