Simply because they change and hide their names, do not give their right age, and by their own admission go about without allowing themselves to be recognized, there is no logic that can deny that they necessarily must exit.

— Heinrich Neuhaus, Pia et ultimissima admonestatio de Fratribus Rosae-Crucis, nimirum: an sint? quales sint? unde nomen illud sibi asciverunt, Danzig, Schmidlin, 1618; French ed. 1623, p. 5

— Umberto Eco, Foucault’s Pendulum