This is a satirical poem against Puritans, published after the Restoration to much official acclaim (Charles II loved it). Of course nowadays we want our satirists to speak truth to the power and punch up, but it’s not so easy in the 17th century. Hudibras is a Puritan justice of peace who goes off on a mission (“a-coloneling”) a little bit like a knight errant. This happens during the Civil War, when men fight over Dame Religion like drunks over a prostitute, although they really don’t know why. People are whipped into frenzy by preachers banging their pulpits, “drum ecclesiastic”. The authorities still quarrel whether Hudibras was wiser or braver, but it’s difficult to decide, because his brain is only slightly bigger than his rage, which makes some people call him a fool. Montaigne’s cat (Montaigne famously wondered in his Essays whether he was playing with his cat, or his cat with him) might consider him a fool too. All that is written in a vigorous, rather irregular tetrameter, which came to be known as hudibrastic verse.