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Anyway, this was the generalized approach put forward by the 13th-century Pope Alexander IV. In his 1258 papal bull Quod super nonnullis, he ordered inquisitors to generally avoid investigating sorcery unless what was happening “clearly savoured of manifest heresy.”

The unassuming beetle, one might argue, is an exemplar of one of Brown’s favorite Jesuit adages: Age quod agis.

SALZBURG, Austria — “What is peace?” a singer asks in Latin at the start of Klaus Huber’s “Quod Est Pax?”

“Quod Deus avertat,” he added, switching to Latin.

He might usefully have concluded his column with the letters we had to put next to solved mathematical equations: QED — quod erat demonstrandum — just to prove his point.