Sociopaths in literature: Yeats' "A Man Young and Old"

I. First Love

THOUGH nurtured like the sailing moon
In beauty's murderous brood,
She walked awhile and blushed awhile
And on my pathway stood
Until I thought her body bore
A heart of flesh and blood.

But since I laid a hand thereon
And found a heart of stone
I have attempted many things
And not a thing is done,
For every hand is lunatic
That travels on the moon.

She smiled and that transfigured me
And left me but a lout,
Maundering here, and maundering there,
Emptier of thought
Than the heavenly circuit of its stars
When the moon sails out.

II. Human Dignity
Like the moon her kindness is,
If kindness I may call
What has no comprehension in't,
But is the same for all
As though my sorrow were a scene
Upon a painted wall.

So like a bit of stone I lie
Under a broken tree.
I could recover if I shrieked
My heart's agony
To passing bird, but I am dumb
From human dignity.