Final answer:
Dryden is satirizing literature in the line about Flecknoe seeking an heir to wage immortal war with wit, criticizing the Restoration literary culture's prioritization of wit over moral and ethical substance.
Step-by-step explanation:
In the line where Flecknoe looks for an heir to wage immortal war with wit (line 12), Dryden is satirizing literature. This satirical critique is directed at the literary culture of the Restoration period, where writers like Flecknoe were more concerned with witty, superficial writing than with substantive moral or ethical content. Restoration comedies of the time typically prioritized wit and social intrigue over virtue, aligning with Dryden's criticism that these writers are waging a kind of war with their cleverness, rather than contributing meaningfully to literature or society. This satirical line delivers a sharp commentary on the superficiality and moral emptiness he perceives in the literary scene of the time.