Bores bore each other too; but it never seems to teach them anything.

Marquis’s epigram turns the social nuisance of “bores” into a small moral observation. Even bores, he notes, are not immune to boredom: when they encounter one another, they inflict the same tedium they impose on everyone else. The sting is in the second clause—this experience rarely produces self-knowledge or reform. The line satirizes a common human blind spot: people can recognize an irritating trait in others while remaining oblivious to it in themselves. It also hints at the limits of negative feedback; mere exposure to one’s own behavior, mirrored back by others, does not automatically lead to insight.