'Joan of Arc was naive, a holy fool – if she wasn’t in secret extremely shrewd and pragmatic. The saintly ‘voices’ she claimed to hear were schizophrenia – if they weren’t ergotism, or epilepsy, or purely a rhetorical device. She cross-dressed for practical reasons – if it wasn’t due to some religious idiosyncracy, or to protect herself from rape, or an issue of gender identity.' (Introduction)