QUESTION: What is Heroic Couplet?
ANSWER: Heroic couplet is prosody. Here the lines rhyme together in pairs, and each line consists of five iambic feet. It was a favoured form of the 18th century.
 One science only will one genius feet;
So vast is art, so narrow human wit.
 Not only bound to peculiar arts,
But oft in those confined to single parts.
[Pope: An Essay On criticism]
 All human things are subject to decay,
And when Fate summons, monarchs must obey