en, Who set it there?

I must abjure the Balm of Life, I must,
Scared by some After-reckoning ta'en on trust,
Or lured with Hope of some Diviner Drink,
To fill the Cup--when crumbled into Dust!

Oh threats of Hell and Hopes of Paradise!
One thing at least is certain--This Life flies;
One thing is certain and the rest is Lies;
The Flower that once has blown forever dies.

Strange, is it not? that of the myriads who
Before us pass'd the door of Darkness through,
Not one returns to tell us of the Road,
Which to discover we must travel too.

The Revelations of Devout and Learn'd
Who rose before us, and as Prophets burn'd,
Are all but Stories, which, awoke from Sleep
They told their comrades, and to Sleep return'd.

I sent my Soul through the Invisible,
Some letter of that After-life to spell:
And by and by my Soul return'd to me,
And answered, "I Myself am Heav'n and Hell:"

Heav'n but the Vision of fulfill'd Desire,
And Hell the Shadow from a Soul on fire,
Cast on the Darkness into which Ourselves,
So late emerged from, shall so soon expire.

We are no other than a moving row
Of Magic Shadow-shapes that come and go
Round with the Sun-illumined Lantern held
In Midnight by the Master of the Show;

But helpless Pieces of the Game He plays
Upon this Checker-board of Nights and Days;
Hither and thither moves, and checks, and slays,
And one by one back in the Closet lays.

The Ball no question makes of Ayes and Noes,
But Here or There as strikes the Player goes;
And He that toss'd you down into the Field,
_He_ knows about it all--HE knows--HE knows!

The Moving Finger writes; and, having writ,
Moves on: nor all your Piety nor Wit
Shall lure it back to cancel half a Line,
Nor all your Tears wash out a Word of it.

And that inverted Bowl they call the Sky,
Whereunder crawling coop'd we live and die,
Lift not your hands to _It_ for help--for It
As impotently moves as you or I.

With Earth's first Clay They did the Last Man knead,
And there of the Last Harvest sow'd the Seed:
And the first Morning of Creation wrote
What the Last Dawn of Reckoning shall read.

Yesterday This Day's Madness did prepare;
To-morrow's Silence, Triumph, or Despair:
Drink! for you know not whence you came, nor why:
Drink! for you know not why you go, nor where.

I tell you this--When, started from