Why did I laugh tonight? No voice will tell

Why did I laugh tonight? No voice will tell:
No god, no demon of severe response,
Deigns to reply from heaven or from hell.
Then to my human heart I turn at once-
Heart!thou and I are here sad and alone;
Say, wherefore did I laugh? O mortal pain!
O darkness! darkness!ever must I moan,
To question heaven and hell and heart in vain!
Why did I laugh? I know this being`s lease-
My fancy to its utmost blisses cease,
And the world`s gaudy ensigns see in shreds.
Verse, fame, and beauty are intense indeed,
But death intenser - death is life`s high meed.