Cui nuptam dicunt Proserpinam (quod Graecorum nomen est, ea enim est quae Hepcrcipnvr] Graece nominatur) — quam frugum semen esse volunt absconditamque quaeri a matre fingunt.
Cicero’s Stoic allegoresis identifies Proserpine explicitly with hidden grain-seed, establishing the cosmological and agricultural interpretation of her myth that underlies all later psychological readings.
, De Natura Deorum (On the Nature of the Gods), -45thesis