A bullet to the head

I saw and heard and knew at last
The How and Why of all things, past,
And present, and forevermore.
The Universe, cleft to the core,
Lay open to my probing sense
That, sick'ning, I would faint pluck thence
But could not, - nay! But needs must suck
At the great wound, and could not pluck
My lips away till I had drawn
All venom out. - Ah, fearful pawn!
for my omniscience paid I toll
In infinite remorse of soul.