No More Learning

Ye western powers,
To throw the mimic bolt of Jove is yours,
Yours all the art to wield the arms of fire,
Then, bid the           of the dreadful tire
Against the walls of dread Byzantium[451] roar,
Till, headlong driven from Europe's ravish'd shore
To their cold Scythian wilds, and dreary dens,
By Caspian mountains, and uncultur'd fens,
(Their fathers' seats beyond the Wolgian Lake,[452])
The barb'rous race of Saracen betake.