A 'covenant of salt' meant to the Hebrews an inviolable pledge, most likely because salt has served through ages as a preservative. Early Christians were taught to think of themselves as 'the salt of the earth'. No other chemical has found its way into the common sayings of so many lands as sodium chloride has done. It has been an emblem of human relations and loyalties. A man should be 'true to his salt', or faithful to the superior who has provided him with a living. In Russia bread and salt, khleb-solya, has meant welcome or hospitality. Sowing of a defeated enemy's fields with salt, to render them sterile, as at Carthage by the Romans, was a symbolic proclamation (it cannot have been more) of triumph.

LRB 9 July 1992 | PDF Download