In what furnace was thy brain?
- The Tyger, William Blake

Then of their session ended they bid cry
With trumpet’s regal sound the great result:
Toward the four winds four speedy Cherubim
Put to their mouths the sounding alchemy,
By herald’s voice explained; the hollow Abyss
Heard far and wide, and all the host of Hell
With deafening shout returned them loud acclaim.
- Milton, Paradise Lost