There is no nonsense so gross that society will not, at some time, make a doctrine of it and defend it with every weapon of communal stupidity.

Davies is warning that collective life has a recurring tendency to elevate foolishness into orthodoxy. What begins as an obviously absurd idea can, under social pressure, fashion, fear, or self-interest, harden into “doctrine”—a set of beliefs treated as unquestionable. The phrase “communal stupidity” suggests that this is not merely individual ignorance but a group dynamic: conformity, slogans, and moral certainty can replace critical thought. The quote also implies that once nonsense becomes socially sanctioned, it is defended aggressively, not with reason but with the full arsenal of group loyalty—ridicule, exclusion, and institutional power. It is a satirical but serious caution about mass opinion and the fragility of rational public discourse.